For a tuna melt sandwich, omit lettuce. Cover bottom half of bagel with 1 tomato slice, 1/4 cup tuna salad and 1 process cheese slice. Broil 6 inches from heat for 1 minute or until process cheese begins to melt. Cover with top half of bagel. Serve warm.
Prepared tuna salad can be stored in tightly covered container in refrigerator up to 3 days.