Cook and drain macaroni; while still hot, drizzle ... onion seasonings and cheese. Toss well. Gently mix Spam, mayonnaise, celery and peas into macaroni. Chill thoroughly.
Cook macaroni until tender and then drain ... onion, seasonings and cheese. Toss well. Gently mix in peas and remaining ingredients. Chill thoroughly. Serve on lettuce leaves if desired.