Boil the pasta in parallel with the preparation of the zucchini sauce. Cook pasta al dente (on the tooth). Prepare the sauce. Pour olive oil into a high saucepan, heat it up and put the finely chopped onion. Fry the onion on low heat for a minute. Cut the zucchini into thin slices. We send it to the onion, add a little fire and fry for a couple of minutes. Add salt and pepper to taste.