What should I do when pasta is undercooked or overcooked?

Rescuing pasta at both ends of the problem, and how to judge doneness so it stops happening.

Difficulty: beginner
Time: 8 min
Read: 2 min

Short answer

Undercooked pasta can finish cooking in the sauce with a splash of pasta water — this is what you should be doing anyway. Overcooked pasta cannot be undone, but tossing it in a hot pan with oil or butter firms the surface and rescues the texture somewhat.

Packet times are estimates made for a rolling boil in plenty of water, and they assume you serve it immediately. Since pasta continues to soften in hot sauce, the useful target is a minute or two under the packet time.

What you'll need

Pan
Reserved pasta water (optional)

Step by step

For undercooked pasta, transfer it into the sauce with a ladle of pasta water.Simmer for two or three minutes. It finishes cooking while absorbing flavour, which is better than draining and boiling further.
If there is no sauce, return it to the water for a minute at a time.Check after each minute. Pasta goes from firm to soft quickly at this stage.
For overcooked pasta, drain it immediately and stop the cooking.A brief rinse in cool water halts it. You lose surface starch, but with mushy pasta that trade is worth it.
Toss overcooked pasta in a hot pan with oil or butter.Two or three minutes over medium-high heat firms the exterior and can give a pleasant slight crispness.
Repurpose it if it is badly gone.Overcooked pasta works in a baked pasta dish, a frittata or a soup, where softness is not the flaw it is in a bowl of spaghetti.
In future, taste two minutes before the packet time.Bite a piece. You want firm resistance with no chalky white core. That is al dente.

Tips

If the pasta will sit in hot sauce or go into a bake, pull it two minutes early. It will keep cooking.
Different shapes and brands vary widely from their stated times. Trust a taste test over the packet.
Fresh pasta is done in two to four minutes and has almost no al dente stage — watch it constantly.

Common mistakes

Trusting the packet time without tasting — It assumes ideal conditions and immediate serving. Tasting takes five seconds and is always accurate.
Draining undercooked pasta and boiling more water — Finishing it in the sauce is faster and produces a better dish than any amount of extra boiling.
Rinsing correctly-cooked pasta — It removes the starch that helps sauce cling. Only rinse when the pasta is overcooked or destined for a cold salad.

Questions people ask

Can you fix overcooked pasta?

Not fully — the starch has broken down. But draining immediately and pan-frying it in oil or butter firms it up, and it works well in a bake, frittata or soup.

How do I know when pasta is al dente?

Bite a piece two minutes before the packet time. It should offer firm resistance with no chalky white centre. If it will sit in hot sauce, stop there.