Defrost shrimps at room temperature. Peel and chop onions and garlic. Clean, wash and dice the peppers. Wash the tomatoes.
Heat oil in a frying pan and sauté onions, garlic and peppers for about 5 minutes. Deglaze with wine, bring to the boil and simmer for about 3 minutes. Add chopped tomatoes, bring to the boil and simmer for about 20 minutes. Season with salt, sugar, pepper and bay leaf.
Wash the fish, dab dry and cut into cubes. Shrimps rinse, dab dry. Add fish to the soup and cook for about 6 minutes. After about 3 minutes add the prawns. Wash parsley, shake dry. Pluck the leaves from the stalks and chop them coarsely, except for a little bit for garnishing. Arrange the stew.