4 c. cooked macaroni, cold
1/2 c. grated Cheddar cheese
3 tbsp. grated red onion
1/2 green pepper, finely chopped
1/2 red pepper, finely chopped
Juice from half a lemon
1/4 c. mayonnaise
3 tbsp. sour cream
1 tsp. dry mustard
1 tbsp. freshly chopped parsley
Salt and pepper

Place macaroni in a bowl and add cheese; mix together. Set aside. In separate bowl, mix together onion, both peppers, mayonnaise, sour cream and mustard. Add parsley, lemon juice and season well; mix again. Pour over macaroni and cheese, and mix to combine. Serve on lettuce leaves, if desired.