- Pour the oil in a pan add garlic clove,Cook for 2 minutes over high heat, add the peeled tomatoes and salt. Cover with a lid and cook over very low heat: the sauce should simmer gently Mix it from time to time. Pour the sauce back into the pan, turn the heat to very low and add the basil leaves. After a few minutes, turn off the sauce and keep it warm. cook the pasta in plenty of boiling salted water Drain the spaghetti directly into the sauce 10 and stir for a few moments over high heat to mix everything together Your spaghetti with tomato sauce is ready.