1 package macaroni
½ cup frozen green peas, thawed
1 can tuna, drained
1 cup mayonnaise or salad dressing
1 cup shredded Cheddar, if desired
¼ cup sweet pickle relish, if desired
2 teaspoons lemon juice
¾ teaspoon salt
¼ teaspoon pepper
1 medium stalk celery, chopped (1/2 cup)
1 small onion, chopped (1/4 cup)