The lamb is going out in twenty minutes and the guest has asked for "a big red, but not too heavy." You have a Pinot Noir, a Rioja and an Australian Shiraz in the locker. Knowing what each will actually taste like - before you pull a cork - is the difference between a good recommendation and a guess.
The big four reds
| Grape | Typical aromas | Body | Tannin | Acidity | Classic homes |
|---|---|---|---|---|---|
| Cabernet Sauvignon | Blackcurrant, black cherry, cedar, mint; oak adds vanilla | Full | High | Medium-high | Bordeaux (left bank), Napa, Coonawarra, Chile |
| Merlot | Plum, black cherry, chocolate | Medium to full | Medium | Medium | Bordeaux (right bank), Chile, California |
| Pinot Noir | Strawberry, raspberry, red cherry; earthy, mushroomy with age | Light | Low | High | Burgundy, Central Otago, Oregon, Sonoma |
| Syrah / Shiraz | Blackberry, black pepper, smoke; warm climates add liquorice and jam | Full | Medium-high | Medium | Northern Rhone (Syrah), Barossa (Shiraz) |
Tannin is the word that matters
Tannin comes from grape skins and oak. It is not a flavour - it is a texture: drying, grippy, like strong stewed tea. High-tannin reds (Cabernet Sauvignon) need food, ideally something fatty or protein-rich, which softens the grip. Low-tannin reds (Pinot Noir) drink happily on their own.
When a guest asks for a red that is "smooth," they almost always mean low tannin - point them at Merlot or Pinot Noir, not Cabernet.
Same grape, different sun
Syrah is the clearest lesson in climate:
- Cool (Northern Rhone, e.g. Crozes-Hermitage): medium body, fresh red and black fruit, distinct black pepper, savoury.
- Warm (Barossa, labelled Shiraz): full body, sweet ripe blackberry, jammy, higher alcohol, soft spice.
Same variety, same word in two languages, two very different bottles.
Three more worth knowing
- Grenache / Garnacha - red berry, spice, high alcohol, low-ish tannin. Backbone of Southern Rhone blends and much of Spain.
- Tempranillo - the grape of Rioja. Strawberry and leather; oak ageing gives vanilla, coconut and a mellow, savoury finish.
- Sangiovese - the grape of Chianti. High acidity, sour cherry, herbs, firm tannin. Built for tomato-based food.
- Malbec - Argentina. Plummy, inky, full-bodied, soft. The easy crowd-pleaser with steak.
Onboard Notes
- Serve reds at 15-18 C, not room temperature. A warm red tastes flabby and alcoholic. Twenty minutes in the fridge fixes most bottles in a hot climate.
- Light reds (Pinot Noir, Beaujolais) can go to 13 C and are excellent chilled on a hot deck - a genuinely useful summer recommendation.
- "Big but not heavy" usually means ripe fruit with soft tannin: reach for Merlot or Malbec, not Cabernet.