Peel and chop the garlic and onion. Peel, wash and dice the carrots. Toast the sesame seeds, remove them.
Heat the oil. Stew the garlic, onion and carrots in it for about 5 minutes. Stir in 3/8 l water and stock, bring to the boil. Simmer for about 10 minutes, puree. Stir in the crème fraîche, season to taste.
Wash and pluck chervil. Scatter chervil and sesame seeds on top.
Cook pasta (spaghetti, yellow and green ribbon pasta, gnocchi, etc.) according to the instructions on the packet and serve with it.