01 -
Bring a large pot of water to a boil. Remove the core from the cabbage by cutting around the stem. Submerge the whole cabbage in boiling water and peel off the leaves as they soften (about 2-3 minutes per layer). Drain and set aside.
02 -
Prepare the rice by cooking it until it's about 75% done. This will prevent it from turning mushy during final preparation. Allow the rice to cool completely.
03 -
Combine the ground beef, pork, cooled rice, onion, garlic, egg, salt, pepper, and optional marjoram in a large mixing bowl. Mix gently by hand until evenly incorporated.
04 -
Lay out a cabbage leaf. Cut out any thick ribs to make folding easier. Place about 2-3 tablespoons of filling on the end of the leaf nearest the stem. Fold the sides over the filling, then roll tightly from stem to tip. Place seam-side down in a baking dish.
05 -
Soak the dried mushrooms in 2 cups of hot water for 30 minutes. Save the soaking liquid, strain to remove grit, and chop the mushrooms. In a saucepan, melt the butter over medium heat. Sauté the onion until soft, then add fresh and dried mushrooms. Cook until browned, about 8-10 minutes. Sprinkle flour over the mushrooms, stir well, and cook for 2 minutes. Gradually add the mushroom liquid and broth while whisking. Simmer for 5 minutes. Remove from heat and stir in the sour cream. Season with salt and pepper.
06 -
Pour the sauce evenly over the cabbage rolls. Cover the baking dish tightly with a lid or foil. Bake in a preheated oven at 350°F (175°C) for 1 hour and 30 minutes, or until the cabbage is tender and the filling is cooked through.