Cacio e Pepe: Three Ingredients, One Emulsion, and the Method That Stops It Clumping
Cacio e pepe, "cheese and pepper," is the Roman dish that proves a great plate can have three ingredients, and it is also the dish most likely to fail in a home kitchen, because pecorino meeting pasta that is too hot seizes into rubbery strings in about four seconds. The fix is not a trick and it is not cream. It is temperature and starch. The cheese wants to melt gently into water that is warm, not boiling, and the starch shed by the pasta into that water is the emulsifier that holds the fat of the cheese and the water together as a sauce, exactly as our pasta method describes and for the same reason a spoon of Dijon holds a vinaigrette. Make a paste of cheese and pasta water off the heat, toss the pasta into it in a warm pan, and it comes together glossy every time. Twenty minutes.
Ingredients, for four
- 400 g (14 oz) dried spaghetti or tonnarelli, bronze-die if you have it; the rough surface holds the sauce
- 150 g (about 1 1/2 cups, finely grated) Pecorino Romano, grated on the finest side of a box grater or a microplane
- 2 teaspoons whole black peppercorns, toasted and coarsely cracked, plus more for the plate
- Fine sea salt for the water, at half the usual rate: about 1 1/2 tablespoons per 5 quarts, because the cheese is very salty
- Optional: 1 tablespoon extra virgin olive oil, for toasting the pepper
Method
- Toast the pepper. Crack the peppercorns coarsely in a mortar or under a heavy pan. Toast them in a dry wide skillet over medium heat for a minute until fragrant, per the spice technique. Take the pan off the heat and leave the pepper in it.
- Cook the pasta in less water than usual. Three quarts for 400 g, salted at half strength, at a full boil. Less water means starchier water, which is the point. Cook to two minutes under the box time, stirring early. Taste for a thin white line at the center.
- Make the paste. While the pasta cooks, put the grated pecorino in a wide bowl. A minute before the pasta is done, ladle out about 1 1/2 cups of the cooking water into a measuring cup. Let it cool for a minute, so it is hot but not boiling, then add it to the cheese a few tablespoons at a time, stirring with a fork into a thick, smooth paste the texture of a loose hummus. Use about half a cup; keep the rest.
- Warm, not hot. Drain the pasta, saving another cup of water, and tip it into the skillet with the pepper, off the heat or over the lowest flame. Let it lose its first fury for thirty seconds. The pan should be warm to the touch, not searing.
- Toss. Add the cheese paste to the pasta and toss quickly and continuously with tongs, adding pasta water a splash at a time, until the sauce turns glossy and clings to every strand. This takes about a minute. If it looks tight, more water; if it looks thin, keep tossing. Do not return it to high heat.
- Plate immediately in warm bowls, with more cracked pepper and a little more grated pecorino. Cacio e pepe waits for nobody; it tightens as it cools.
Why it clumps, and the fix for each
| What happened | Why | Fix, this time and next |
|---|---|---|
| Strings and clumps of rubbery cheese | The pasta or pan was too hot; the proteins in the cheese seized before the fat could emulsify | Add a splash of cool pasta water and toss off the heat; it may loosen. Next time: paste first, warm pan, thirty-second pause |
| Grainy, sandy sauce | Cheese grated too coarsely, or old and dry cheese | Grate finer; buy a wedge and grate it yourself; pre-grated cheese has anti-caking starch that fights you |
| Watery, pooling at the bottom | Not enough starch in the water, or too much water added | Cook in less water next time; this time, keep tossing over low heat until it tightens |
| Salty to the point of pain | Full-strength salted water plus a very salty cheese | Half-salt the water; taste before adding more cheese at the plate |
| Bland | Not enough pepper, or pepper that was not toasted | Toast it, crack it coarse, and use more than seems reasonable; the dish is named for it |
Notes and variations
The cheese. Pecorino Romano is the dish; it is sharp, salty and sheep's milk, and it is what a Roman uses. Half pecorino and half Parmigiano is gentler and slightly easier to emulsify, and it is what many restaurants quietly do. Parmigiano alone is a different, milder dish. The pasta. Tonnarelli, a square-cut fresh egg spaghetti, is traditional in Rome; a good dried bronze-die spaghetti is the everyday version, and the shapes guide explains why the rough surface matters. The pepper. Tellicherry or a good single-origin black pepper is the difference between a background note and the point of the dish; pre-ground pepper does not toast and does not belong here. Scaling. For eight, double everything but work in two batches at the tossing step; a crowded pan cools unevenly and clumps. In Denver, the pasta takes a minute or two longer and the water evaporates faster, so save extra; the cheese behaves the same.
The pecorino, the spaghetti and the peppercorns are at 263 Josephine Street in Cherry Creek, Denver, and ship nationwide from theambrosianpantry.com. The starchy water is the part you make.
