Pouring beaten eggs into a skillet that is still sitting on a hot burner is how spaghetti carbonara turns into pasta with scrambled eggs. Egg yolks start to thicken at around 150°F (66°C) and set into firm curds not far above that. A pan straight off a high flame is far hotter, and the eggs touching the metal set before they can coat anything.
Carbonara has no cream, no butter and no flour, yet a good one has a sauce as glossy as custard. That sauce is an emulsion of rendered pork fat, starchy pasta water, cheese and egg, held together at a temperature high enough to thicken the yolks and low enough to keep them smooth. Getting there is one technique, and once you understand it, the recipe is just shopping and boiling water.
The Technique: A Warm Emulsion, Not a Cooked Egg
An emulsion is a mixture of two liquids that normally separate, like fat and water, with tiny droplets of one spread through the other. Mayonnaise and hollandaise are both emulsions held together by egg yolk. Carbonara uses the same trick at the stove.
What each ingredient does
- Egg yolks contain lecithin and other proteins that coat fat droplets and keep them suspended. As they warm, they also thicken the sauce.
- Whole eggs add more liquid and white protein, which makes the sauce a little lighter. Too many whites make it runny and more likely to curdle.
- Pasta water is cloudy with starch released from the noodles. Starch thickens the water and helps stabilize the emulsion.
- Rendered guanciale fat carries the pork flavor through the sauce.
- Finely grated Pecorino Romano melts into the sauce and seasons it with salt.
Controlling the heat
The whole method comes down to adding the eggs at the right moment. Drain the pasta, put it into the pan with the guanciale and its fat, and take the pan off the burner. Toss for about 1 minute. The pasta and pan cool slightly, the noodles get coated in fat, and the starch on their surface starts to thicken the little water that clings to them. Then pour in the egg and cheese mixture and toss constantly while adding hot pasta water a spoonful at a time.
The residual heat of the pasta is what cooks the eggs. Tossing keeps the mixture moving so no single spot gets too hot. Adding pasta water gradually controls both the thickness and the temperature: it is hot enough to warm the sauce and wet enough to loosen it.
Why Spaghetti Carbonara Needs No Cream
Cream is a common addition outside Italy, often used as insurance against curdling, because the fat and liquid in cream dilute the eggs and make them thicken more slowly. It works, but it mutes the flavor of the cheese and pork, and the sauce tastes heavier.
With the off-heat method, the insurance is not needed. If the sauce is thickening too fast, a splash of pasta water cools and loosens it in seconds. If it is too thin, a few more seconds of tossing, or a moment back over very low heat, thickens it. That level of control is what cream was standing in for.
Cooking pasta in less water
Use about 3 quarts (2.8 liters) of water for a pound of spaghetti instead of the usual 4 to 6 quarts. Less water means more concentrated starch, which gives a cloudier, more effective cooking liquid for the sauce. Stir the pasta often during the first 2 minutes so it does not stick. Use less salt than usual in the water too, about 1 tablespoon of Diamond Crystal kosher salt, because Pecorino is salty and the reserved water goes into the sauce.
Applying the Technique
Cut the guanciale into strips about 1/4 inch thick and 1 inch long. Start them in a cold skillet over medium heat. A gradual start lets the fat render out before the meat browns, so the strips end up crisp at the edges and tender in the middle, and the pan fills with clear fat. This takes 8 to 10 minutes. If the guanciale is browning fast while the fat is still white and solid, lower the heat.
While the pork renders, whisk the yolks, whole eggs, most of the cheese and plenty of coarsely ground black pepper in a bowl until smooth. The mixture should be thick, like a loose paste. Leaving the bowl near the stove takes the chill off the eggs, which helps them blend into the hot pasta without seizing.
Time the pasta so it finishes 1 minute before the package says. It will keep softening in the sauce. Scoop out a full mug of pasta water before draining. It is easy to forget, and there is no carbonara without it.
If the eggs start to scramble
Small curds forming on the bottom of the pan mean it is too hot. Immediately add 2 tablespoons of pasta water and toss hard, scraping the pan. A few small curds will melt back into the sauce. For a nearly fail-safe method, combine the pasta and egg mixture in a heatproof bowl set over a pan of barely simmering water instead of in the skillet; the gentle steam heat makes overcooking very unlikely, at the cost of a second pan to wash.
Shopping for Guanciale and Pecorino
Guanciale is sold in Italian delis and some larger supermarkets, usually as a whole or half cheek with a dark, peppery rind. Trim the rind off before cutting; it is too tough to render. The layered meat and fat underneath should be creamy white and pink, not yellow. A piece keeps for several weeks wrapped in the refrigerator and freezes well, so it is worth buying more than one recipe needs.
Pecorino Romano is a hard, salty sheep’s milk cheese. Buy a wedge rather than pre-grated tubs, which often include anti-caking agents that stop the cheese melting smoothly into the sauce. Grate it on the finest holes of a box grater or a rasp. Fine, fluffy cheese melts almost instantly into warm egg; coarse shreds form stringy clumps.
Grind the pepper coarsely, either in a mill set to its widest setting or by crushing whole peppercorns under the bottom of a heavy pan. The name carbonara is often linked to the look of black pepper flecks through the pale sauce, and the coarse pieces add bursts of heat that fine pepper does not.
Make the Carbonara
Serves four as a main course. Have the egg mixture whisked and the mug of pasta water ready before draining the spaghetti; the final steps take under 3 minutes.
The recipe
Spaghetti Carbonara
Spaghetti tossed off the heat with rendered guanciale, egg yolks, Pecorino Romano, black pepper and starchy pasta water into a glossy sauce without cream.
- Prep
- 10 min
- Cook
- 20 min
- Total
- 30 min
- Serves
- 4
Ingredients
Method
- Render. Put the guanciale in a cold 12-inch skillet and set over medium heat. Cook, stirring occasionally, for 8 to 10 minutes, until the fat has rendered and the edges are crisp. Turn off the heat.
- Mix the eggs. Whisk the yolks, whole eggs, Pecorino (reserve a little for serving), Parmigiano and pepper into a smooth, thick paste.
- Boil. Bring 3 quarts (2.8 L) of water to a boil with the salt. Cook the spaghetti 1 minute less than the package time, stirring often at first. Scoop out 1 cup of pasta water, then drain.
- Coat with fat. Add the spaghetti to the skillet with the guanciale, off the heat. Toss for about 1 minute to coat with fat and cool slightly.
- Emulsify. Pour in the egg mixture and 2 Tbsp pasta water. Toss constantly, adding more pasta water 1 Tbsp at a time, for 1 to 2 minutes, until the sauce is glossy and coats the pasta like thin custard. If curds form, add water immediately and toss hard.
- Serve. Serve at once with extra Pecorino and black pepper.
Notes
- The eggs are gently heated, not cooked to 160°F (71°C). Use pasteurized eggs for anyone pregnant, very young, elderly or immunocompromised.
- For a gentler method, toss the pasta and egg mixture in a heatproof bowl set over barely simmering water.
Oven temperatures are for conventional ovens; for convection, reduce by about 25°F (15°C).
Variations and a Note on Eggs
Pancetta is the easiest substitute for guanciale, which is cured pork cheek. Pancetta is leaner and renders less fat; add 1 tablespoon of olive oil to the pan. Thick-cut bacon works but adds smoke, which changes the character of the dish. Parmigiano-Reggiano can replace some or all of the Pecorino for a milder, nuttier sauce.
Rigatoni and bucatini hold the sauce well too. Cook them to 1 minute short of the package time, exactly as with spaghetti.
In carbonara the eggs are gently heated, not cooked to the 160°F (71°C) recommended for fully cooked egg dishes. For anyone pregnant, very young, elderly or with a weakened immune system, use pasteurized eggs, which are sold in the shell in many supermarkets and behave the same way in the sauce.
Carbonara is best eaten right away; the sauce tightens as it cools. Leftovers keep for 2 to 3 days refrigerated. Reheat gently in a skillet with a splash of water over low heat, tossing constantly, until hot all the way through.