Cover cabbage leaves with boiling water. Cover and let stand until leaves are limp, about 10 minutes. Remove leaves; drain. Mix hamburger, rice, onion, mushrooms (with liquid), salt, pepper, garlic, salt and 1/2 cup of the tomato sauce. Place about 1/3 cup hamburger mixture at stem end of each loaf. Roll leaf around hamburger mixture, rucking in sides. Place cabbage rolls sea sides down in ungreased square baking dish, 8 x 8 x 2 inches. mix remaining tomato sauce, the sugar and lemon juice; pour over cabbage rolls. Cover and cook in 350 degree oven until hamburger is done, about 45 minutes. Mix cornstarch and 1 Tablespoon water in saucepan. Stir in liquid from cabbage rolls. Heat to boiling, stirring constantly. Boil and stir 1 minute. Serve sauce with cabbage rolls.
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