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Burro e Parmigiano

Tagliatelle al burro e Parmigiano is the elemental fresh-pasta dish: cold butter, freshly grated Parmigiano-Reggiano, a ladle of pasta water, freshly cracked pepper. Done correctly, it is one of the great preparations in Italian cooking. Done badly, it is a pile of pasta in soup. The difference is the technique of mantecare.

The ingredients

The dish has, in its strictest form, four ingredients beyond the pasta:

• Butter. Cold, cubed, of the highest quality you can find. An Alpine cultured butter (Beppino Occelli, Vallée d'Aoste) or a French beurre cru is ideal; a good supermarket unsalted butter is acceptable. Salted butter can work but adjust the cooking water salt downward. For four servings, 80 g.
• Parmigiano-Reggiano DOP. Freshly grated, never pre-grated from a packet. A 24-month aging is the standard; 30-month gives a sharper, drier finish. For four servings, 80 to 100 g.
• Pasta water. Salted, starchy, reserved before draining. The third ingredient and the one that makes the dish work. Reserve a generous ladleful.
• Black pepper. Freshly cracked, generously, at the end. Some kitchens add a small grating of nutmeg as well; the Bolognese reading tolerates this in moderation.

The technique: mantecare

The dish is built on the technique of mantecare — to emulsify cooked starchy ingredients with butter and cheese off the heat, working pasta water into the mixture until a glossy creamy sauce forms. The same technique finishes risotto (with the addition of butter and cheese at the end, off the heat, vigorously stirred); the same technique finishes tagliatelle al limone, papalina, and any number of butter-based pasta sauces. Knowing it is, in some sense, knowing how Italian pasta is finished.

The principle: cold butter and grated cheese, added to hot pasta with starchy water, off direct heat, with vigorous tossing or stirring, will form a stable emulsion of fat and water. The starch in the pasta water acts as the emulsifier. The result is a creamy coating on the pasta that uses no actual cream. It is the central trick of Italian cooking.

The method

For four servings:

1. Boil the pasta. Salted water; 2 to 3 minutes for fresh tagliatelle. Reserve at least 250 ml of the cooking water before draining.
2. Warm the pan. A wide skillet or sauté pan, off the heat or on the lowest possible flame. Add the cold cubed butter and a ladle (about 100 ml) of the hot pasta water. The butter begins to melt into the water, forming a milky base.
3. Add the pasta. Tip the drained pasta into the pan. Toss with a wooden spoon, lifting and stirring, to coat each ribbon with the butter-water.
4. Add the cheese, in stages. Off the heat (or on the lowest flame), add the grated Parmigiano in two or three additions, tossing vigorously between each. The cheese melts into the butter-water emulsion and thickens it; the sauce should turn from milky to silky.
5. Adjust with more pasta water if needed. If the sauce is thick or claggy, add another splash of pasta water. If it is loose, toss longer; the pasta will absorb some of the water and the sauce will tighten.
6. Finish with pepper. A generous cracking of black pepper, an optional faint grating of nutmeg, and onto the plate.

The variants

• With sage (burro e salvia). Two or three sage leaves are crisped in the melting butter before the pasta is added. The butter takes a faint herbaceous and slightly nutty note. Pairs particularly well with tajarin and with stuffed pastas (ravioli, tortelli) but works on tagliatelle.
• With sage and walnuts. The above plus a handful of chopped toasted walnuts at the end. A Piedmontese autumn version.
• With more cheese. A Roman variant, the ancestor of fettuccine Alfredo, uses double the butter and double the Parmigiano for an almost cheese-thick sauce. The same dish is sometimes called al doppio burro — double-butter — in Bologna.
• With Parmigiano and pepper. The pasta version of cacio e pepe: heavy on the cheese and very heavy on the pepper, the pasta water doing all the emulsification. A Roman dish more traditional on tonnarelli or spaghetti.

The dish's status

Burro e Parmigiano is, on most Bolognese trattoria menus, the simplest first course offered — sometimes the children's portion, sometimes the option for diners who want a foundational pasta without the heaviness of ragù. It is also a working technique: any home cook who can finish a pasta dish with butter, cheese, and pasta water can finish almost any pasta dish in the Italian repertoire. The principle generalises.

Outside Italy, the dish travels almost unchanged, except for its name: the famous American fettuccine Alfredo, in its original Roman form from Alfredo di Lelio's restaurant, was essentially the same dish on fettuccine rather than tagliatelle. The dish became internationally celebrated in 1927 when the actors Mary Pickford and Douglas Fairbanks ate it in Rome on their European honeymoon; the cream-heavy American version is a later modification that, in Italy, is not what is meant by Alfredo.

Why the cheese matters

The dish lives or dies on the cheese. Pre-grated Parmigiano from a packet is uniformly inferior — the grating exposes new surface area that oxidises and dries within hours; supermarket pre-grated is often weeks old. Grate at the table or just before cooking. Grana Padano is a perfectly acceptable substitute (cheaper, milder, 9 months minimum aging versus Parmigiano's 12); aged Pecorino Romano is too sharp for the dish and pushes it into Roman territory. The 24-month Parmigiano is the working standard; 30-month is the choice for special occasions.