Cut half centimeter onion rings. Heat the COMBEKK Fry Pan to medium-high heat with olive oil to coat the bottom. Add onions and turn the pan down to medium. Cook for 20-30 minutes before stirring. Flip the onions. Brown them evenly. Add a couple tablespoons of water to release the fond and avoid burning. Within an hour, onions should be perfectly browned.
Mix together the beef, egg, panko and mustard and season with salt and pepper. Mix it all well, form patties and grill in the COMBEKK Fry Pan. Cook on high heat for a couple minutes on each side to get a nice sear. Cut buns and brush them with clarified butter or olive oil and grill or toast until golden. Now you’re ready to build your burger with the caramelized onions.