Place Savoy cabbage, leek, potatoes and sweet potatoes in an ovenproof dish, pour a little water, cover and cook 15-20 minutes in a microwave on Max or until vegetables are tender. You can also cook them in the usual way, about 20-30 minutes, with a little more water. Drain well vegetables, add Vegeta Natur, mash and cool. Add flour and bread crumbs to the mashed vegetables. Mix and combine, shape patties and coat them with remaining bread crumbs. Fry patties in a grill pan, thinly brushed with little oil or in a regular pan in hot oil until golden.