In A Skillet, Cook Beef, Onion And Garlic Over Medium Heat Until Meat Is No Longer Pink; Drain. Stir In Tomato Sauce And Paste, Ketchup, Brown Sugar And Soy Sauce; Mix Well. Bring To A Boil. Reduce Heat; Cover And Simmer For 15-20 Minutes, Stirring Occasionally. Spoon About 1/2 Cup Meat Mixture Onto Each Bun.