Put onion, garlic and peppers in some water, add some salt and cook until peppers are soft. In the mean time start cooking the spaghetti.

Blend all the peppers with the onion and garlic, with a bit of water. You need enough water to make it of a smooth consistency (not too runny not too thick). Add the sauce to the drained spaghetti and add some cream. Cook for a further 2 min.