Corned Beef Sandwich Filling
["1 c. cut-up cooked corned beef", "1/2 c. mayonnaise", "1/3 c. finely chopped celery", "1 Tbsp. finely chopped onion", "2 tsp. mustard"]
["Mix all ingredients.", "Makes enough filling for 4 sandwiches."]
["beef", "mayonnaise", "celery", "onion", "mustard"]