Take the bread and put it in a toaster oven or broiler until it’s medium toasted. Then drain the tuna, and mix it with mayo and cut up celery. Put the tuna on the toast, then put a layer of cheese on top of that. Last, put the whole thing back in the toaster or oven just until the cheese melts. This is a really great meal if you need something quick and easy but still tastes good. Enjoy!