The Red Grapes

There are more than a thousand grape varieties in commercial production. You need ten. These ten make the majority of the red wine sold in the world, and if you can place them on a structural map, every other red you meet becomes "like this one, but."

The map has two axes: tannin and acid. Learn where each grape sits on those two before you learn what it smells like, because structure is what you can feel with your eyes closed and aromas are what a hundred producers can push around with oak and ripeness.

Low tannin, high acid. Pinot Noir is the reference point. Pale in the glass, silky, red cherry and earth, and it makes your mouth water. Grenache lives nearby on tannin but lower on acid and much higher on alcohol: ripe strawberry, warm spice, a soft grip.

Medium tannin, high acid. The food wines. Sangiovese, the grape of Tuscany, tastes of sour cherry, tomato leaf, and dried herbs and wants a plate next to it. Tempranillo, the grape of Rioja, is Spain's shape-shifter: fresh and red-fruited when young, all leather and tobacco and dill after long aging in American oak.

Medium tannin, medium acid. Merlot is soft-spoken on the surface and serious underneath: plum, chocolate, round tannins. It is the most misunderstood grape on this list, and the Right Bank of Bordeaux is where it proves the point. Zinfandel sits here on structure but runs hot on alcohol: raspberry and blackberry jam, bramble, black pepper. Check the label; 15 percent is normal.

High tannin. Cabernet Sauvignon is the classic big red. Thick skins, firm tannin, deep color, blackcurrant and cedar, and it ages for decades. Syrah, called Shiraz in Australia, is its savory cousin: black fruit, black pepper, smoked meat, olive in cooler places; plush and smoky in warm ones. Malbec is inky and plush, plum and violet and cocoa, with generous tannin that goes soft with ripeness.

High tannin, high acid, and pale. Nebbiolo, the grape of Barolo and Barbaresco. This is the one that breaks the rule everyone assumes: that dark wines are big and pale wines are light. Nebbiolo looks like Pinot Noir in the glass and then grips your gums like young Cabernet. Rose, tar, sour cherry, leather. Color lies. Nebbiolo is the proof.

From this chapter on, the bottles go in bags. That is what the reds side of the Deductive Sheet is for. It works as a funnel: circle from the top and each band removes rows from the table underneath.

First, pigment: low, medium, high. This alone splits the ten into three groups. Second, structure: tannin, acid, alcohol. Third, fruit: red, black, blue, or dried, and its condition, tart, ripe, baked, or jammy. Fourth, one non-fruit tell, maybe two. Tomato leaf points at Sangiovese. Tar and rose point at Nebbiolo. Black pepper and meat point at Syrah. Dill points at Rioja. Then instinct. Stop at two candidates and let your gut pick.

The grid is not a cheat sheet. It is training wheels. After a few flights you will find you are not looking at it, because the funnel is running in your head.

Half of what confuses people about red wine is not the grape. It is the barrel. Vanilla, toast, coconut, and smoke are not in any grape. They come from oak aging, and a Tempranillo raised in new American oak smells nothing like the same grape in old neutral barrels. When you smell vanilla, write it down as a secondary note and move on. It tells you about the winemaker's choice, not the grape's identity. Chapter 5 covers this properly.

Four reds, blind. Bag them, number them, and shuffle before anyone sees the labels. Use the reds side of the Deductive Sheet for each one, then transfer your call to the Flight of Four.

1. Pinot Noir, Burgundy (a Bourgogne Rouge or a village wine). The same grape you tasted from Oregon in chapter 1, now earthier and more savory. Swap: any Bourgogne Rouge under $30.
2. Sangiovese, Chianti Classico. High acid, medium tannin, cherry and tomato leaf. Swap: any Chianti Classico under $25.
3. Tempranillo, Rioja Crianza. Medium everything, with oak doing the styling: dill, leather, strawberry. Swap: any Rioja Crianza under $20.
4. Cabernet Sauvignon, Bordeaux Left Bank (a Haut-Médoc or a Cru Bourgeois). High tannin, cedar, blackcurrant, graphite. Swap: a Cabernet from Chile's Maipo Valley.

If you have a fifth glass, add a Côtes du Rhône Villages for Grenache, the high-alcohol, low-tannin corner the four above do not cover.

When you reveal, do not just check who was right. Ask what the tell was. The person who called Sangiovese because of the tomato leaf has learned something permanent. The person who guessed it has not.

Reach for Cabernet, Syrah, or Malbec, in that order of familiarity. If they come back and say the first one was "too dry," they almost never mean sugar. They mean tannin. Pour them a Merlot or a Grenache and watch the face change. Guests use the word dry to describe grip, and once you know that, you can translate.

Tannin grips the gums. Acid makes you salivate. Know the difference and you know the grape.

Next: The White Grapes. Six grapes, and the one conversation every wine drinker eventually has about Chardonnay.