A guest hands you a glass and says the wine is "too dry". You taste it: bone-dry, yes, but the real culprit is a wall of young tannin from a Barolo opened three years early. Being able to tell sweetness from acidity from tannin is what turns a vague complaint into a fix.
Calibrating your own palate
Structure is measured against a mental scale you build by tasting widely and by using reference points. Everyone starts miscalibrated, usually reading tannin as "dryness" and acidity as "sourness".
| Component | What it feels like | Where it comes from | Low reference | High reference |
|---|---|---|---|---|
| Acidity | Mouth waters; tart, fresh, crisp | Grape, cool climate, early picking | Ripe Chilean Chardonnay | Muscadet, Chablis, Riesling |
| Tannin | Dry grip on gums; furry, chalky, chewy | Grape skins, seeds, stems, oak | Beaujolais, Pinot Noir | Young Nebbiolo, Cabernet Sauvignon |
| Alcohol | Warmth in throat and chest | Sugar in the grape at harvest | Mosel Kabinett (around 8% abv) | Amarone, Zinfandel (15%+) |
| Body | Overall weight and texture | Alcohol, sugar, extract, oak | Pinot Grigio | Oaked Chardonnay, Shiraz |
| Sweetness | Sugar detected on the tip of the tongue | Residual sugar left after fermentation | Fully dry Sancerre | Sauternes, PX Sherry |
The classic confusions
- Tannin is not dryness of taste. A wine can be bone-dry with no tannin at all (any white) or sweet and tannic (some Port). Tannin is a tactile sensation, not a flavour.
- Acidity is not sweetness's opposite. They coexist. Great sweet wines such as Tokaji and German Riesling Auslese carry very high acidity, which is exactly why they taste fresh rather than cloying.
- Alcohol is not body, though it contributes. A 14% Chardonnay with no oak and high acid can feel lighter than a 13% Rhône white.
- Oak is not a flavour of the grape. Vanilla, coconut, toast and smoke come from the barrel, not the vineyard.
Temperature changes what you measure
Serve too cold and you flatten aroma and exaggerate acidity and tannin. Serve too warm and alcohol dominates and the wine tastes flabby.
| Style | Service temperature |
|---|---|
| Sparkling and light sweet | 6-8 C |
| Light, crisp whites and rosé | 7-10 C |
| Fuller whites, lighter reds (Beaujolais, Pinot Noir) | 10-13 C |
| Medium and full-bodied reds | 15-18 C |
Working the fix
If the tannin is aggressive, decant and give it air, and put it against fat and protein: the guest's steak will soften it far more effectively than an apology. If a white tastes flat, it is often simply too warm.
Onboard Notes
- An 18 C "room temperature" is a Northern European drawing room, not a sun deck in Antigua. In the Caribbean a red served at ambient temperature is 28 C and undrinkable; give reds 20 minutes in the fridge before service.
- Guests often say "dry" when they mean "tannic" and "sweet" when they mean "fruity". Ask what they last enjoyed rather than debating vocabulary.