Tuna And Cheese On A Bun
["1/4 c. drained, flaked, water packed tuna", "1 Tbsp. diced celery", "1 Tbsp. diced red onion", "3/4 tsp. prepared mustard", "1 Tbsp. light mayonnaise", "dash of oregano", "salt and pepper to taste", "1 slice cheese (regular or low-fat)"]
["Mix all together. Put on bun. Add the slice of cheese. Wrap in foil on a pan. Bake in 300\u00b0 oven just enough to heat or melt the cheese."]
["water", "celery", "red onion", "mustard", "light mayonnaise", "oregano", "salt", "cheese"]