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Some of my friends pour cold water on pasta after boiling it other don't. What do the professionals do? If they pour cold water on the pasta after the boil, what do they want to accomplish with doing it?

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3 Answers

up vote 16 down vote accepted

I would strongly suggest not pouring cold or any other kind of water on pasta; it will rinse the delicious starches off its surface, which would otherwise help your sauce cling to it.

To counteract the negative consequences of overcooking due to remaining heat (which, as belisarius suggests in his answer, is the reason other stuff is often rinsed with cold water), just serve it immediately. You want to have the sauce (hot and) ready just before your pasta is, so you can drain the pasta, mix with the sauce, and put it on the table.

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I usually use the pasta water to thicken the sauce ... so the pasta regains the starches while sauteeing "nothing is created, nothing is lost, everything is transformed" :D – belisarius Nov 22 '10 at 5:21
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Also note that "serve it immediately" is not always possible for large batches. – belisarius Nov 22 '10 at 5:24
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Or, slightly undercook it if you need a few minutes to plate. Rinsing in cold water both removes the starch (helps stick the sauce to the noodle), but it also cools the noodles down (which is not good eats). – Bruce Alderson Nov 22 '10 at 5:42
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You can however use this effect to your advantage. If you're making pasta that you're not going to sauce, you can rinse off the starch thus causing reducing the pasta's tendency to clump together. – Magnus Nordlander Nov 22 '10 at 11:31
+1 I always wondered why the sauce wouldn't stick :) – takrl Aug 4 '11 at 15:18

Pour cold water on boiled things when you want to stop the cooking process. Once you get "al dente" stage, the pasta will quickly get past that, so cooling it with cold water helps you manage the final state.

Be aware that the pasta will lose temp, that is going to be re-gained when you briskly sautee it afterward (with some salsa, hopefully).

PS: for vegetables, quickly immersing them in ice-cold water after boiling helps to retain the bright color (although I don't know why).

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In the case of the vegetables, it's called "shocking". My understanding of the process is that other minerals and gases in the cells escape, leaving the chlorophyll more visible. Shocking the vegetables causes the chlorophyll to stabilize before it has a chance to break down. – GalacticCowboy Nov 22 '10 at 13:52
I rearranged your last sentence; even though I eventually understood what you meant, it seemed a little odd reading the phrase "...boiling in ice-cold water". – Aaronut Nov 22 '10 at 19:46
@Aaronaut Thanks ... It was surely a mix of deficient English and an idle mental state :D – belisarius Nov 22 '10 at 19:55
It also cools it down after boiling and draining in a colander. – HelpfulAnswers4u Apr 30 at 14:38
@HelpfulAnswers4u Sure, eventually, but it'll still be steaming for a few minutes - it's nothing like running cold water over it. – Jefromi Apr 30 at 18:59

Your pour cold water over pasta if you don't want the noodles to stick together later. If you are making enough for the amount of servings -- that you will eat right away -- then it is ok not to. As Erik's answer pointed out, the sauce will stick better onto the noodles.

So you are cooking pasta in bulk and will refrigerate some of it for later consumption, it is better to dump cold water on it. Otherwise, you'll end up with a glob of pasta that you can't sort out later.

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