Peel onion and carrot, chop and mix with minced meat and vegetable seasoning. Fry in a heated vegetable oil for 15 minutes, stirring. Put into a colander and give a little shake. Boil potatoes, crush, add 1 tbsp. butter, sour cream, and stir. Put half of the puree, then minced meat and the remaining mashed potatoes in a casserole dish pre-oiled and sprinkled with breadcrumbs. Level the surface out, brush with the remaining oil and bake at 220 °C for 15 minutes.