Greek Salad

I made this salad for a Sunday night church fellowship meal we had. I didn't eat it because I don't like raw onions or cauliflower, but it actually sounds good, still!  I guess I should have tried it!

1 head iceberg lettuce, chopped (I used Romaine)
1 red onion, sliced
1 pound bacon - cooked, drained and chopped
1 head cauliflower - broken into small pieces

Layer all ingredients until time to serve. Then toss with dressing.

Dressing:
2 cups mayonnaise
1/2 cup grated Parmesan cheese
1/4 cup sugar