Dice meat to small cubes, about 3 cm. Add the onion and sauté in oil until golden. Remove from heat and add paprika, plus 100ml water.
Return to bubble for 2-3 minutes. Add meat and season. Cover and simmer for 30-40 minutes, until sauce has thickened, stirring frequently. Add sliced peppers and tomato and cook for another 5-6 minutes.
Stir in sour cream, let it bubble briefly. Serve hot with a dollop of sour cream and accompany with plain boiled rice.