Start collecting pasta water before draining, reserving at least one cup. The starch it contains acts as a natural emulsifier, helping fat and liquid bond together seamlessly. But timing matters. A Michelin-starred sous chef we interviewed revealed that most home cooks use pasta water too late, after the sauce is already set. Instead, add it in stages. The Three-Stage Method First, when your sauce is still loose (before adding pasta), add a splash—about 2 tablespoons—while your butter or oil is still emulsifying. This helps build a stable base. Second, immediately after combining pasta and sauce, add another 2-3 tablespoons while stirring vigorously for 30 seconds. This integrates everything. Finally, if your finished dish seems too thick, add pasta water one tablespoon at a time to loosen without introducing dairy (which can sometimes break at high heat). Pasta water is free umami and thickening power that's been hiding in plain sight. The starch also creates subtle body that feels expensive. A simple aglio e olio becomes silkier. A thin pomodoro becomes more cohesive. Keep the pasta water at a rolling boil until the very moment you need it—temperature matters. Cold pasta water won't emulsify properly. This technique works for cream sauces, oil-based sauces, and tomato sauces equally well. It's the secret behind why restaurant pasta tastes finished while home versions often feel one-dimensional.