Spaghetti Aglio e Olio

Why This Spaghetti Aglio e Olio Works

As the spaghetti boils, starch from the pasta moves into the water. A bit of that starchy water is saved, and later it clings to the olive oil in the pan. When the hot pasta hits the garlic oil and the pasta water is added, the starch and oil mix and turn into a light, silky coating instead of a greasy puddle. That’s why the noodles look glossy and not oily.

While the pasta cooks, the garlic slowly browns in the oil. As it softens and turns golden, the garlic flavor spreads through the oil. The red pepper flakes warm in that same oil, so their heat spreads out too, instead of sitting in sharp little spots.

Once the pasta is tossed in, the hot noodles soak up some of the flavored oil and water. The parsley goes in at the end so it stays bright and fresh, and the Parmesan, if used, melts slightly on contact, sticking to the coated strands instead of clumping.

Mistakes To Avoid

Letting the garlic get too dark in the oil can wreck the whole pan. Once it crosses from light golden to deep brown, it turns harsh and bitter, and that bitter taste spreads through all the spaghetti since the oil is the main “sauce.”

Adding the garlic to oil that is already very hot often makes the slices fry too fast. The outside browns in seconds while the inside stays a bit raw, so some pieces taste burnt and others taste sharp, and the oil ends up unevenly flavored.

Draining all the pasta water without saving any makes the dish come out dry. The spaghetti then just soaks up the oil and clumps together, instead of forming a light, glossy coating that slides around the pan.

Throwing the parsley into very hot oil or keeping the pan on the heat after adding it can cause it to sizzle and wilt too hard. The leaves turn dark and soggy, and little burnt green bits stick to the pasta instead of staying fresh and soft.