1. Using a sharp knife, cut the crusts off of each slice of bread. Roll each slice with a rolling pin to flatten. Sprinkle cheese on each piece of bread, adding 6 slices of pepperoni on top. Roll up tightly, seal with a dab of water if needed. Repeat with the remaining bread slices, cheese and pepperoni.
2. Place 1 tbsp. of butter in a large non-stick pan and set over medium heat
3. Melt remaining butter in a bowl. Dip one roll into the butter at a time, then transfer to the hot pan. Cook for 1-2 minutes per side or until golden the roll is golden brown and the cheese is melted. Plate and serve with tomato sauce of dipping.