Crochete de cartofi dulci cu mozarella

500-600 g sweet potatoes peeled and grated, a finely chopped white onion, 100 ml vegetable stock soup, 30 g butter + a tablespoon of oil, mozzarella, 100-150 g panko, salt, pepper, frying oil

Saute the onion together with butter and oil in a wide pan with high walls, then add the potatoes. Fry for about 3-4 minutes, then pour the soup. Boil everything until the liquid drops completely. When it is ready, it is cooled, blend it and add the egg and 50 gr breadcrumbs.
Cut the mozzarella in small cubes. Form a ball of potatoes with the cheese inside and roll it in the rest of panko. Fry in sunflower oil until is golden brown.