Drain the mozzarella. Peel and wash the potatoes. Wash and clean the tomatoes. Cut both into slices. Chop the pepperoni as desired. Melt the fat in a pan and fry the potato slices for about 5 minutes until golden brown.
Cut mozzarella into cubes. Whisk eggs and 3 tablespoons of water. Season with herbs, salt and pepper. Add tomatoes, pepperoni and mozzarella cubes to the potatoes. Pour on egg milk and let it set covered for about 10 minutes