When dinner isn’t planned and you don’t know what to make tuna melts are a great last-minute dinner dish (or lunch). They don’t take long to make and use staple ingredients — bread, cheese, and tuna. It’s also full of healthy protein. All of the dressing ingredients for the tuna mixture can be substituted with similar ingredients. If you don’t want to use mayonnaise you can use basic vinaigrette to season the tuna. To make a complete meal just add a side salad, veggie sticks, or sliced apples or pears (whatever you happen to have on hand). You could even heat up some frozen vegetables for a side.