Dessert is coming, and the owner wants "something sweet, but not sickly". The best sweet wines in the world are defined not by sugar but by the acidity that carries it - and by two natural processes that concentrate the grape.
How the sugar gets there
| Method | What happens | Classic examples |
|---|---|---|
| Noble rot (botrytis) | Botrytis cinerea punctures ripe grapes in humid mornings and dry afternoons; water evaporates, concentrating sugar, acid and flavour | Sauternes, Tokaji Aszú, German BA and TBA |
| Freezing on the vine | Grapes freeze; the ice (water) is pressed out and left behind | Eiswein / Icewine (Germany, Austria, Canada) |
| Drying the grapes | Picked grapes are dried on mats or racks (appassimento/passito) | Recioto della Valpolicella, Vin Santo |
| Stopping fermentation | Chilling, filtering or fortifying leaves unfermented sugar | Moscato d'Asti, Port |
Noble rot adds its own signature: honey, marmalade, dried apricot, saffron, beeswax.
Sauternes
Bordeaux, south of the city, where the cold Ciron meets the warmer Garonne and generates the autumn mists that botrytis needs. Blended from Sémillon (the botrytis magnet), Sauvignon Blanc and sometimes Muscadelle. Yields are tiny, pickers pass through the vineyard repeatedly selecting affected berries, and in some years nothing is made at all - which explains the price. Sauternes and Barsac were classified in 1855 alongside the Médoc, with Château d'Yquem alone at Premier Cru Supérieur.
Tokaji
Hungary, from Furmint and Hárslevelű. Botrytised berries (aszú) are added to a base wine, and the concentration is expressed in puttonyos - the higher the number, the sweeter and more concentrated. Eszencia is the free-run nectar from the aszú berries: extraordinarily sweet, barely alcoholic, and rare. Tokaji is marked by fierce acidity, orange peel and apricot.
Serving and pairing
- Serve cold: 6-9 C. Small glasses, modest pours - it is intense.
- The rule that matters: the wine should be as sweet as, or sweeter than, the dessert. A great Sauternes against a sugary cake will taste thin and sour.
- The classic pairings are savoury, not sweet: Sauternes with foie gras or Roquefort; a sweet wine's acidity cuts salt and fat brilliantly.
Onboard Notes
- Half-bottles are your friend. A 750ml Sauternes for two guests is waste; buy 375ml where you can.
- Once opened, a botrytis wine will hold for several days refrigerated - the sugar and acid protect it - but a first-growth Sauternes should not be left to linger regardless.
- Never describe these wines as "dessert wine" to a guest who says they dislike sweet wine. Offer it with the cheese instead, and let it do the work.