Cooking Method:

1. Roll out the dough until is paper-thin.
2. Cut into 2-3 inch circles.
3. In a medium mixing bowl,combine ground beef chopped yellow onions.Mix well.Season with salt and black pepper.Moisten with 1-2 tablespoons beef stock.
4. Place 1 teaspoon of beef filling in the center of each circle.Moisten the edges with the egg white and fold over to form a crescent shape.
5. Bring remaining beef stock to a rolling boil and drop in the pelmeni.
6. Cook for about 15 minutes.
7. Serve with sour cream.