Pesto Pasta

Finely mince 100 g onion and cook in 28 g olive oil over low heat until soft and translucent, about 5 minutes.

Bring salted water to a boil in a large pot and cook 134 g pasta until al dente, 1–2 minutes before package time.

Reserve 120 ml pasta water, then drain pasta and add to the onion pan with medium-high heat.