Cook spaghetti in boiling salted water according to package instructions. Add peas 5 minutes before the end of cooking time. Peel garlic and dice finely. Heat oil in a pot, fry garlic. Dust with flour and sauté briefly.
Add 200 ml water and whipped cream. Bring to the boil, stir in the stock, simmer for 5 minutes. Drain the pasta and let it drain. Stir in lemon zest and juice. Season sauce with salt, pepper and sugar.
Mix the pasta with the sauce. Serve with basil and lemon wedges.