Wash lemon hot, grate dry and finely grate the peel of 1/2 lemon. Halve the lemon, squeeze the juice (approx. 4 tbsp.). Peel and chop shallot and garlic. Wash, clean, quarter and cut the zucchini into pieces
Heat 1 tablespoon of oil in a saucepan. Sauté the shallot and garlic for 2-3 minutes. Deglaze with stock, lemon juice and buttermilk. Bring to the boil and simmer for about 5 minutes. Prepare pasta in boiling salted water according to package instructions. Stir starch and 1 tbsp. water until smooth, stir into the lemon sauce, bring to the boil again and simmer for about 1 minute. Season to taste with salt, pepper and sugar. Keep sauce warm
Rinse the prawns and pat them dry. Heat 1 tablespoon of oil in a large frying pan. Fry the prawns and courgettes for 4-5 minutes, turning them over. Season with salt and pepper. Drain the noodles and add to the sauce. Wash the dill, shake dry and pluck the flags. Arrange noodles, prawns and zucchini on plates. Sprinkle with dill