1Heat large pan over medium heat.
Cook bacon til well done, turning occasionally.
Set aside on paper towels
2Cut lettuce into 3/4 inch squares. Cut grapes in half or quarters, if large. Cut bacon and tomatoes into 1/2 inch squares.
Make dressing. Mix mayonnaise and ketchup in small cup with smooth.
Mix remaining ingredients in large bowl and toss with dressing. Serves 10 to 12