1 (10 oz.) pkg. frozen peas, thawed
2 med. green peppers, chopped
1 med. red onion, sliced thin
2 (5 oz.) cans sliced water chestnuts, drained
3 med. carrots, grated
2 (15 1/4 oz.) cans pineapple tidbits, drained
2 (4 oz.) cans sliced mushrooms, drained
1 sm. head iceberg lettuce
1 1/2 c. mayonnaise
1 1/2 c. sour cream
5 tbsp. sugar

Break lettuce into pieces and line a 9 x 13 x 2 inch baking dish with lettuce. Layer vegetables and pineapple over lettuce.

Frosting: Mix mayonnaise, sour cream and sugar. Spread frosting on top of layered salad. Cover dish and chill 2 hours. Top with 12 ounce grated Cheddar cheese. Chill 2 additional hours.