Open the tuna can and drain the water
Using a can opener get the tuna out and drain all the water from it. Make sure you do not hurt yourself while opening the can. Add all the tuna to a mixing bowl and break any big chunks of tuna. Remember, the tuna pieces have to be small in size for the sandwich.
Add mayonnaise and remaining ingredients
Add the amount of mayonnaise you desire to the tuna and mix it well with the help of a fork. Then add the remaining ingredients such as the chopped celery, salt and pepper as you keep mixing the ingredients until they are properly combined.
Add cheese, tuna and lettuce on bread
Take two slices of bread and place cheese, lettuce and the required tuna mixture on one side. You can also add tomatoes if you like. Place the other slice on top after you are done.
Place the sandwich on a heated saucepan
Preheat a saucepan and add a few drops of butter to it. Place the sandwich in the pan and make sure that the heat is not too high. After waiting for about two minutes or when you feel that the side of the sandwich has turned golden brown in colour, flip it.
Cut the sandwich in half and serve
Once you are done, remove the sandwich from the saucepan and place it on a serving dish. Cut the sandwich in half diagonally and serve while hot.