In a large bowl, mix together the broccoli, cauliflower, shredded Cheddar cheese and bacon. Blend mayonnaise, sugar and vinegar and add to first mixture.
In large bowl combine broccoli, cauliflower, bacon, onion, tomatoes and ... small bowl combine mayonnaise, sugar & vinegar. Mix ... pour dressing over salad, toss and serve. 6-8 servings.