Some time ago, as I emptied a big pot of pasta water into the sink and waited for the fog to lift from my glasses, a simple question occurred to me. Why boil so much more water than pasta actually absorbs, only to pour it down the drain? Couldn’t we cook pasta just as well with much less water and energy? Another question quickly followed: if we could, what would the defenders of Italian tradition say?

The standard method for cooking pasta is to heat to a rolling boil 1.7 to 2.6 liters of well-salted water per kilogram of pasta. The usual rationales are that abundant water quickly recovers the boil when the pasta is added, gives the noodles room so that they don’t stick to one another, and dilutes the starch they release, so they don’t end up with a“gluey surface.

To see which of these factors are really significant, I put half a kilogram of spaghetti into a pot, added just 2 liters of cold water and about 10 grams of salt and turned on the heat. The water took about 8 minutes to reach the boil, during which I had to push the noodles around occasionally to keep them from sticking. They took another 10 minutes to cook through.

When I drained the pasta, it had the texture and saltiness I expected, seemed about as sticky as usual, and when tossed with a little oil, seemed perfectly normal. So I tried reducing the water even further, to 1.4 liters. I had to stir often because that’s not quite enough to keep all the pasta immersed all the time, but again the spaghetti came out fine.

Why can pasta cook normally in a small volume of water that starts out cold? Because the noodles absorb water only very slowly at temperatures much below the boil, so little happens to them in the few minutes it takes for the water to heat up.

I described my method in e-mail messages to two of this country’s best-known advocates of Italian cuisine. Lidia Bastianich told me: “My grandmother would have thought of the idea surely as blasphemous. I think it is curious. And Marcella Hazan said,“I am a very curious person, and I’m glad people are exploring new ways. Both of them gave it a try.

Ms. Bastianich responded with a controlled experiment. She started spaghettini in pots of cold water and boiling water - using three-fourths of her usual amount - side by side and found the cold-water version lacking in the texture and flavor she looks for. Ms. Bastianich agreed that using less water is O.K.“But please‘butta la pasta’in boiling water, she said.

Ms. Hazan tried starting a batch of shell pasta in a somewhat reduced amount of cold water, and found that it needed constant stirring to avoid sticking.“Maybe you save heat energy, but you also have to work a lot harder, she told me.

Heartened by the experts’willingness to experiment, I went back to work, this time starting with hot water. I found that it’s possible to butta la pasta in 1.5 or 2 liters of boiling water without having the noodles stick.

I prefer starting with cold water, because the noodles don’t stick together at all as they go into the pot, and because I don’t notice a difference in flavor once they’re drained and sauced. It’s true, though, that no matter what temperature you start with, this method requires more stirring.

If you cook pasta often, try experimenting with different starting temperatures and amounts of water. Be sure to use a pot broad enough for the noodles to lie flat on the bottom, and to reduce the salt for smaller volumes of water.