Defrost the peas. Drain the corn. Cut turkey breast into large cubes. Pluck parsley leaves and chop, except for some for garnishing. Stir salad mayonnaise and yoghurt until smooth. Stir in chopped parsley.
Season to taste with salt and pepper. Mix salad dressing with peas, turkey cubes and corn. Wash and clean the tomatoes and cut off one lid each. Hollow out the tomatoes and fill with the turkey salad. Arrange the tomatoes and garnish with the remaining parsley