Salade de Tomates à la Crème

• 12 ripe tomatoes
• 1 Spanish onion, finely chopped
• 6 tablespoons olive oil

Cut the tomatoes in slices and place on a dish; sprinkle with finely chopped onion and moisten with a simple dressing, made with olive oil and wine vinegar seasoned with salt and freshly ground black pepper. Mix mayonnaise and cream, and cover tomatoes and onions. Sprinkle with parsley.