Step 1

Butter each slice of bread and flip them over onto a large, flat surface. Spread the mayonnaise over 2 slices of bread and layer with tomato, cheese, and pepperoni. Assemble the sandwiches, buttered side facing up.

Step 2

Heat a non-stick pan over medium-high heat. Grill the sandwiches, 1 at a time, for 2 to 3 minutes or until the cheese begins to melt. Flip and grill for an additional minute until the cheese melts.

Step 3

Remove the sandwich from the cutting board and allow the sandwich to cool for 5 minutes before packing it into a lunch container.