Wash the tomatoes, drain well and cut into slices. Cut the pepperoni into slices. Grate mozzarella.
Heat a pan without fat. Put a tortilla in the pan. Sprinkle half of the mozzarella on top, half of the tomatoes and pepperoni on top. Place a second tortilla on top. Fry on both sides over medium heat for 5-7 minutes each, remove.
Make a second quesadilla from the remaining ingredients.
Wash coriander, shake dry and pluck leaves from the stems. Put a few leaves aside for garnishing. Cut avocados in half, remove seeds and peel the flesh. Puree the flesh with lime juice and coriander.
Season to taste with salt and pepper.
Quarter the quesadillas, arrange them on a plate and sprinkle with salt and pepper. Garnish with coriander. Add guacamole.