DRESSING INGREDIENTS: 1 1/2 cups mayonnaise + 2 teaspoons sugar - mix In a trifle dish, layer the lettuce, spinach, celery, mushrooms, eggs, onion, bacon / ham, and peas. Spread the dressing over the top of the peas. Put shredded cheddar over the dressing, cover with plastic and refrigerate 8 hours or overnight.