Wash and dry broccoli and cauliflower. Cut flowerets into bite-size pieces. Slice onions. Combine mayonnaise, vegetable oil, sugar, and ... serving. Stir several times.
In a large bowl, mix together the broccoli, cauliflower, shredded Cheddar cheese and bacon. Blend mayonnaise, sugar and vinegar and add to first mixture.
Break flowers in small pieces of broccoli, and break small pieces of cauliflower. Mix with crumbled bacon. Then mix sugar, mayonnaise, vinegar, mix with other ingredients and refrigerate.
In large bowl combine broccoli, cauliflower, bacon, onion, tomatoes and ... small bowl combine mayonnaise, sugar & vinegar. Mix ... and serve. 6-8 servings.