Dressing Combine mayonnaise, ketchup, white wine vinegar, sugar, sweet pickle relish, white onion, salt, and pepper in a small bowl. Stir well. Place dressing in a covered container and refrigerate for several hours, stirring occasionally, so that the sugar dissolves and the flavors blend. Salad Rinse all produce. Slice grape tomatoes in half, peel and shred the carrot, slice cucumber in half, then slice in ½ inch half-moons.  Place all sliced produce and mixed greens in a large mixing bowl and combine.  Top with dressing.