Cut peeled and cleaned pumpkin into small cubes. Mix well with chopped onions, mutton fat or its crackling, red pepper, and salt. Make stiff dough out of flour, salt, egg, and water, let stand for 30-40 minutes. Roll out dough into flat layer about 1-2 mm and cut into 10x10 cm squares. Place a heaping tablespoon of filling in the center, pinch edges up around the filling completely enclosing. Place manti on greased layer of kaskan, and steam for 30 minutes.