Does cooking pasta in the sauce actually work?

The usual way to cook pasta is in a big pot of boiling salted water, drained and then tossed with sauce. Cooking it in the sauce instead sounds like a shortcut and turns out to be a technique in its own right. Italian home cooks call one version pasta risottata: as a GialloZafferano blog post explains it, the pasta is not boiled but cooked in just enough water, which it absorbs as it goes, like a classic risotto, with more hot water added a little at a time if needed. Done well, it is one of the most satisfying ways to make a quick dinner.

Why it works

When pasta cooks in a big pot of water, much of the starch it releases goes down the drain. When it cooks in a small amount of sauce, all of that starch stays put. It thickens and binds the sauce into something glossy and creamy, and the pasta absorbs the sauce's flavour as it softens rather than just water. That is the same principle behind saving pasta water, taken further (see what pasta water is for).

Two ways to do it

The risotto method

Make a loose sauce in a wide pan. Add the dry pasta and a ladle of hot water or stock, and stir. As the liquid is absorbed, add more, a ladle at a time, stirring often, tasting the pasta as you go. When it is nearly done, let the last of the liquid reduce until the sauce clings, then finish with cheese and oil off the heat.

The one-pan, all-in method

Put pasta, chopped vegetables, aromatics, olive oil, salt and a measured amount of water in a wide pan together and simmer, stirring often, until the pasta is cooked and the liquid has become a sauce. Popular, simple, and less exact: it needs more watching, because there is no chance to adjust the liquid gradually.

We prefer the risotto method because it gives more control.

What works

• Short, sturdy shapes. Rigatoni, penne, fusilli, mezze maniche, ditalini, orzo. They stay separate, cope with stirring, and release starch evenly.
• Loose sauces. Tomato sauces, vegetable sauces, bean sauces, and anything that tolerates long simmering and a lot of stirring.
• Wide pans. A deep frying pan or sauté pan rather than a narrow saucepan, so the pasta cooks in a shallow layer.
• Hot liquid. Keep a kettle or a pan of hot, lightly salted water or stock on the go. Cold liquid stalls the cooking.

What goes wrong

• Sticking and scorching. Starch plus little liquid equals a sticky pan bottom. Stir often, scrape well, keep the heat moderate.
• Gluey texture. Too little liquid too early, or overcooking. Add liquid before the pan looks dry and taste regularly.
• Uneven cooking. Long pasta can clump and cook unevenly in a small amount of liquid. If you want spaghetti, break it or use a very wide pan and stir constantly with tongs.
• Over-salting. As the liquid reduces, salt concentrates. Season lightly at the start and finish at the end.
• Delicate sauces. Pesto, raw tomato sauces and butter or cheese emulsions do not survive long cooking. Make them the classic way and finish in the pan.

The cues to watch

• The sauce turns glossy and creamy, not watery, as the pasta releases starch.
• The pasta is tender with a little bite in the centre. Taste it; the packet time is only a guide, and it may cook at a slightly different pace in sauce than in water (see al dente).
• The sauce clings to the pasta and slides slowly when you tilt the pan. Too tight, add a splash of water; too loose, cook a moment longer.
• It thickens off the heat, so stop when it still looks a touch looser than you want.

When it is worth it

On a hot night when you do not want a big pot of boiling water steaming up the kitchen. When you want one pan to wash. When the sauce is flavourful enough that you want the pasta to soak it up. For a crowd, or for very large quantities, the classic method is usually easier to control.