Clean, clean and halve the mushrooms. Clean, wash and cut spring onions into rings. Wash the tomatoes. Heat 2-3 tablespoons of oil in a frying pan. Sauté the mushrooms in it while turning them, season with salt and pepper and take them out.
Wash the shrimps and pat them dry. Add 2 tablespoons of oil to the frying fat, heat up and fry the prawns for about 4 minutes, turning them over. Season to taste with salt, pepper and lemon juice and remove. Wash parsley, shake dry and chop finely.
Add 1 tablespoon of oil to the frying fat, heat up. Add spring onions and tomatoes and fry for 3-4 minutes while turning. Add shrimps and mushrooms, mix, heat briefly and season again with salt and pepper.
Serve sprinkled with crème fraîche and parsley.