Cabbage Rolls with carrot

1 head cabbage , center core removed 2 -3 tablespoons butter 1 cup chopped onion 1 lb ground beef 1 lb ground pork 1 lb ground veal 2 cups cooked white rice 1[...]

2 heads cabbage 1 1/2 lbs ground beef 1 ounce raw rice 3 ounces onions , minced 1 ounce carrot , grated 1 teaspoon salt 1/2 teaspoon pepper 1 whole egg 2[...]