Section 5 · Fortified Wines
Sherry
Sherry is arguably the most misunderstood wine in the world. It is not one thing, it is a family of wines ranging from bone-dry to intensely sweet, from pale and delicate to dark and powerful. Understanding Sherry means understanding two uniquely complex processes: the solera system and biological ageing under flor. Both are heavily tested on the WSET Level 3 exam.
Aroma kit focus: green olive, almond, yeast/bread, dried fruit, caramel, walnut, sea salt, orange peel
The Sherry Triangle
Sherry (called Jerez or Xerès in Spanish and French) can only be produced in a defined area of south-western Spain, centred on three towns known as the Sherry Triangle:
- Jerez de la Frontera: the historic centre, home to most major Sherry bodegas
- Sanlúcar de Barrameda: a coastal town at the mouth of the Guadalquivir river. Its unique humid, maritime microclimate produces a specific style called Manzanilla.
- El Puerto de Santa María: on the coast between Jerez and Sanlúcar
Climate
Hot and sunny. Rainfall is high for Spain but falls mostly outside the growing season. Two winds shape the vintage: the poniente, a cool, humid wind off the Atlantic, and the levante, a hot, drying wind from the east that can stress the vines.
One point worth remembering: none of the techniques used for Sherry (fortification, flor, the solera) is unique to Jerez. What is unique is the combination of place, grape, climate and tradition.
Sherry Region Map
Tap or hover over any area to see its key details.
Grapes and Soil
Palomino
Palomino is the grape used for the vast majority of Sherry production. It is deliberately neutral: on its own, it produces a fairly bland, low-acid white wine with little aroma. But this neutrality is exactly what makes it ideal for Sherry: the grape is a blank canvas on which the ageing process paints all the character. Palomino accounts for about 95% of plantings in the region.
Pedro Ximénez (PX)
Used to make intensely sweet Sherry. Its thin skins suit sun-drying (soleo), which concentrates the sugars before pressing and fermentation. Most PX grapes are actually grown in neighbouring Montilla-Moriles, which the rules permit for Sherry. PX Sherry is one of the sweetest wines in the world, like liquid raisins.
Muscat of Alexandria
A small amount used for sweet wines. Less important than PX for the exam.
Albariza: The Magic Soil
Albariza is Sherry's most important soil type, a brilliant white chalky soil made primarily of limestone, clay, and silica. It looks almost like snow when dry. Albariza has two critical properties:
- Water retention: in this extremely hot, dry region (minimal summer rainfall), albariza is deep and very high in chalk, so it absorbs winter rain and holds it like a sponge, releasing moisture back to the vine roots during the scorching summer. Growers help it along by digging rectangular pits between the rows in autumn to trap the rain, then smoothing them over in spring. A hard crust forms on the surface in summer, limiting evaporation and reflecting sunlight back up to the canopy.
- Quality signal: the best Sherry vineyards are on albariza. The two other soil types (barro/clay and arena/sand) produce lower-quality wines.
Exam Angle
Albariza is a favourite exam topic. Be ready to explain: what it is (white chalky limestone soil), why it matters (retains water in hot dry climate, reflects sunlight), and where the best vineyards are (on albariza hills around Jerez).
How Sherry Is Made
Step 1: Base Wine
Palomino grapes are harvested and pressed quickly to limit oxidation, then fermented in stainless steel (at around 22–26°C) to dryness, producing a neutral, light, dry white wine around 11–12% ABV.
Step 2: First Classification
By autumn the cellar master tastes each vat of new wine and classifies it based on its delicacy and potential. Flor starts to form on all the wines at this stage; the decision is whether to let it live:
- Lighter, more delicate wines (typically from cooler coastal sites or cooler fermentations) → selected for biological ageing (Fino and Manzanilla)
- Fuller, less delicate wines (typically from warmer inland sites) → selected for oxidative ageing (Oloroso)
Step 3: Fortification
The classified wines are fortified with neutral grape spirit (about 95% abv):
- Wines destined for biological ageing are fortified to 15–15.5% ABV. This level allows flor to survive.
- Wines destined for oxidative ageing are fortified to 17% ABV. This level kills the flor, ensuring the wine ages oxidatively.
Step 4: Sobretabla and Second Classification
The fortified wines rest for several months in a stage called sobretabla before they enter a solera. Then comes a second classification: wines meant for biological ageing whose flor has failed to thrive are refortified for oxidative ageing (this is one route to Palo Cortado), and wines that disappoint are rejected.
Step 5: Ageing (in the Solera System)
All Sherry ages in the solera system (explained below). The type of ageing, biological or oxidative, determines the final style.
Sweet wines
For PX and Muscat, the sun-dried grapes give a juice so sweet that it ferments only a few degrees before it is fortified to 17% abv.
Biological Ageing: The Flor
Flor is a film of living yeast cells that forms naturally on the surface of the wine in partially filled barrels. It is one of the most extraordinary phenomena in winemaking, and it only occurs reliably in the Sherry region (and a few other places like Jura in France).
What Flor Is
Flor is a layer of Saccharomyces yeast that, after fermentation is complete, rises to the surface of the wine and forms a thick, creamy, wrinkled film. It looks like a floating white pancake. The barrels are deliberately filled only about 5/6 full, leaving a gap of air above the wine for the flor to sit on.
What Flor Does
- Protects from oxygen: the flor layer acts as a physical barrier between the wine and the air, preventing oxidation. This is why Fino stays pale and fresh.
- Feeds on the wine: the yeast cells consume glycerol and remaining traces of sugar, making the wine even drier, lighter, and more austere
- Produces acetaldehyde: a compound that gives Fino its distinctive sharp, pungent, green-olive, almond, bread-dough character
- Consumes alcohol: flor slightly reduces the wine's alcohol level over time
Conditions for Flor
- Alcohol must be 15–15.5%: above 15.5%, the yeast dies
- Humidity and moderate temperatures: the flor thrives in the humid conditions of bodegas near the coast, which is why Manzanilla (from coastal Sanlúcar) has the thickest, most consistent flor. It is most vigorous in spring and autumn and dies back in the heat of summer and the cold of winter
- Nutrients: the flor needs fresh wine to feed on, which is why the solera system (constantly refreshing the oldest barrels with newer wine) is essential. Even so, flor cannot be sustained indefinitely: it fails once the average age of the wine reaches about seven years, which is why Fino soleras rarely exceed three to four years of average age
The bodegas themselves help: tall, whitewashed buildings with high ceilings and damp earth floors keep the air cool and humid, and some now use air-conditioning.
The Solera System
The solera is a fractional blending system most closely associated with Sherry, though it is not unique to Jerez. It is the key to Sherry's consistency and complexity.
How It Works
The wine is held in old 600-litre butts, filled about five-sixths full. Imagine a stack of barrel rows (called criaderas), arranged by age; in practice the rows of one solera are often kept in separate buildings:
- Bottom row (solera): the oldest wine. This is where Sherry is drawn off for bottling.
- Middle rows (1st, 2nd, 3rd criadera, etc.): progressively younger wine
- Top row (youngest criadera): the newest wine enters here
The process:
- When Sherry is needed for bottling, an equal amount is drawn from every butt in the solera (oldest barrels). The solera is never fully emptied
- The solera is then topped up with wine from the 1st criadera (next oldest), usually via a blending tank so that every butt receives the same blend
- The 1st criadera is topped up from the 2nd criadera
- And so on, up to the youngest criadera, which receives new wine from the sobretabla
The result: Because old wine is never completely emptied and new wine is constantly blended in, the solera produces a wine of consistent style with no distinct vintage. Only an average age can be given. The average age of the wine increases over time, and old soleras can contain fractional components that are decades (even centuries) old. Oxidatively aged soleras can run for 30 years or more, and because water evaporates faster than alcohol through the wood, the alcohol slowly climbs towards 22%.
Most Sherry on the shelf is a blend of several soleras. Fining and filtration are being reduced, especially for the biologically aged wines; en rama on a label means the wine was bottled with minimal treatment.
Sherry Styles
Dry Styles (from Palomino)
Fino
Ageing: Entirely biological (under flor). Fortified to 15–15.5%.
Style: Pale lemon colour. Bone dry. Light body. Pungent aromas of green olive, almond, bread dough, yeast, and sometimes a saline/salty edge. Crisp acidity. Should be served chilled and consumed fresh after opening (like white wine, it oxidises once the bottle is open).
Food pairing: Tapas, almonds, olives, fried fish, jambón ibérico. One of the world's greatest food wines.
Manzanilla
Ageing: Biological (under flor), but exclusively in Sanlúcar de Barrameda.
Style: Even lighter and more delicate than Fino. Very pale. Distinctly saline, with chamomile, green apple, and bread-dough notes. The thicker flor in Sanlúcar's humid, coastal conditions produces the lightest, most delicate style of Sherry. Has its own separate DO (Manzanilla-Sanlúcar de Barrameda).
Amontillado
Ageing: First biological, then oxidative. The wine starts as a Fino under flor, but at some point the flor dies (either naturally as the wine ages and alcohol rises, or deliberately by fortifying to 17%+). The wine then continues to age oxidatively in the solera.
Style: Amber colour. Dry. Medium body. Combines characteristics of both ageing types: the pungent, nutty sharpness of biological ageing with the deeper, richer, caramel-toffee notes of oxidation. Aromas of hazelnuts, dried herbs, tobacco, and toffee. Complex and age-worthy.
Oloroso
Ageing: Entirely oxidative. Fortified to 17%+ from the start, so flor never develops.
Style: Deep amber to mahogany colour. Dry: the name Oloroso (like Amontillado and Palo Cortado) is reserved for dry wines, so there is no “Oloroso dulce”. Full body. Rich, complex aromas of walnut, dried fruit, leather, toffee, and dark spice. Fortified to 17%, with the alcohol rising towards 22% over long ageing as water evaporates through the butt. Despite being dry, the concentrated, rich flavours can give an impression of sweetness.
Palo Cortado
Ageing: The rarest Sherry style, and the one defined by its style rather than by a single process. It is made in various ways. Some Palo Cortado is identified at the second classification, when a wine destined for Fino shows more body than expected and is refortified for oxidative ageing; other examples are selected later. What the bottle must deliver is the combination below.
Style: Sits between Amontillado and Oloroso, with the aromatic complexity of an Amontillado and the body and richness of an Oloroso. Dry, deep amber, intensely concentrated. Highly prized by connoisseurs.
Sweetened Styles (dry wine plus sweetening)
These are made by blending dry Sherry with a sweetening agent, usually PX wine or rectified concentrated grape must (RCGM). The three categories are separated mainly by how much sugar they carry.
Pale Cream
A wine with a short period of biological ageing, so it stays pale, sweetened typically with RCGM to keep the colour light. Pale lemon, sweet, simple.
Medium
Traditionally a wine that had both biological and oxidative ageing (an Amontillado-type base), sweetened with PX. Amber, medium-dry to medium-sweet, with nutty notes under the sugar.
Cream Sherry
Traditionally an oxidatively aged wine sweetened with PX, though the rules were soon relaxed and Cream is no longer only sweetened Oloroso. Medium to deep amber. Sweet, rich, and smooth. The most commercially popular sweet Sherry style. Harvey's Bristol Cream is the best-known brand.
Naturally Sweet Styles (from dried grapes)
Pedro Ximénez (PX)
Made from sun-dried Pedro Ximénez grapes. Extremely sweet, up to around 500 g/L of sugar: like liquid raisins, with flavours of dried fig, date, chocolate, coffee, and molasses. Very dark, almost black. Thick, syrupy texture. Often poured over vanilla ice cream as a dessert. Aged in its own solera system.
Muscat
The other naturally sweet style, from sun-dried Muscat of Alexandria. Rarer than PX, with the grape’s floral, orange-peel perfume alongside the raisin.
Age-Indicated Sherries
Each batch of VOS and VORS is tested before release. There are also 12-year and 15-year categories, which apply to a whole solera rather than a batch.
Sherry Styles at a Glance
| Style | Ageing Type | Colour | Sweetness | Key Aromas |
|---|---|---|---|---|
| Fino | Biological | Pale lemon | Bone dry | Green olive, almond, yeast, bread |
| Manzanilla | Biological (Sanlúcar) | Very pale | Bone dry | Chamomile, salt, green apple |
| Amontillado | Biological then oxidative | Amber | Dry | Hazelnut, toffee, dried herbs |
| Oloroso | Oxidative only | Dark amber | Dry | Walnut, leather, dried fruit |
| Palo Cortado | Biological then oxidative | Amber | Dry | Complex: nutty + rich |
| Pale Cream | Short biological + sweetened (RCGM) | Pale lemon | Sweet | Simple, light, grapey sweetness |
| Medium | Biological then oxidative + sweetened | Amber | Medium-dry to medium-sweet | Nuts, toffee under the sugar |
| Cream | Oxidative + sweetened (PX) | Dark amber | Sweet | Toffee, dried fruit, caramel |
| PX | Oxidative (from dried grapes) | Very dark | Very sweet | Raisin, fig, molasses, coffee |
What the Exam Expects You to Know
- The Sherry Triangle: three towns, location, climate
- Albariza soil: what it is, why it matters
- Palomino as the main grape (neutral, canvas for ageing process)
- The solera system: how it works, why it ensures consistency
- Biological ageing under flor: what flor is, what it does, what conditions it needs
- Oxidative ageing: how it differs, what it does to the wine
- All Sherry styles and their ageing types: Fino, Manzanilla, Amontillado, Oloroso, Palo Cortado, Pale Cream, Medium, Cream, PX
- Fortification levels: 15–15.5% for biological ageing, 17% for oxidative (rising towards 22% with long ageing)
- VOS and VORS age indicators
- Why Manzanilla is different from Fino (location, thicker flor, lighter style)
Short Answer Strategy
Sherry questions are very common. If asked to explain the difference between Fino and Oloroso, structure your answer around the ageing process: Fino = biological ageing under flor (15–15.5% ABV, flor protects from oxygen, produces acetaldehyde = pungent, pale, light, dry). Oloroso = oxidative ageing without flor (fortified to 17% ABV, exposed to oxygen = dark, rich, nutty, full-bodied, dry).
Active Recall Prompts
Close this page and try to answer these from memory:
- Name the three towns of the Sherry Triangle.
- What is albariza and why is it important for Sherry production?
- What is flor? Name three things it does to the wine.
- Why is Sherry for biological ageing fortified to only 15% while oxidative Sherry is fortified to 17%?
- Explain how the solera system works in four steps. How much is drawn from each butt?
- What is the difference between Amontillado and Oloroso in terms of ageing?
- Why is Manzanilla lighter than Fino?
- What do VOS and VORS indicate on a Sherry label?
- How is PX Sherry different from other sweet Sherries?