Step 2

Open and drain the tuna. Add it to a bowl with the celery and carrot pieces. Add the Buffalo sauce, ranch dressing and pepper, then stir to combine.

Step 3

Once the tuna is prepared, heat the butter in a medium skillet over medium heat. Once the butter is melted, add the bread to the skillet and toast until golden brown, about 4 to 5 minutes.

Step 4

Flip one slice of bread over in the pan. Spoon the tuna onto the toasted side and gently spread and flatten it to evenly distribute. If you have leftover tuna, cover and refrigerate it to enjoy tomorrow. Layer mozzarella cheese onto the tuna. Pick up the second slice of bread and put it toasted-side down onto the cheese to help it melt. Flip the entire sandwich over and reduce heat to low. (Feel free to regrease the pan with a little more butter or cooking spray before placing the sandwich back down.)

Step 5

Cover the sandwich and continue to toast it until the cheese is melted, about 2 to 3 minutes.