The water left after cooking pasta is not waste, but a valuable culinary ingredient that Italian chefs call 'liquid gold.' Its value comes from the starch released from the pasta during cooking.
The starch in this water acts as a natural emulsifier. It helps to combine fats (such as olive or butter) and more watery components of the sauce (tomato juice, broth), creating a smooth, uniform, and glossy texture that evenly coats the pasta. Without this element, the sauce can separate.
Using this technique is simple: before draining the water, just pour out a couple of cups of the cloudy liquid. Then, the almost-cooked pasta can be brought to full readiness right in the sauce in the pan by adding a small amount of this water and stirring.
This is a professional technique that helps turn a homemade dish into a restaurant-quality one.
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