Cut the fish fillet into bite-sized pieces and marinate with the scampi in lemon juice for 30 minutes.
Chop the vegetables very finely: cut the leek into rings, grate the carrot, cut the zucchini into sticks, thread the snow peas and cut in half crosswise.
Heat the butter in a pan with a high rim, add the shallot and vegetables one after the other and cook over a high heat while stirring constantly. Add the mushrooms, fish cubes and scampis, season with salt and pepper and add the saffron threads. Cook for about 3 minutes, turning frequently.
Mix in the wine and cream and let it boil down briefly over reduced heat. Season again to taste.