Combine ground beef, chopped onion, and salt. Shape the mixture into patties, each about 3/4" thick. Brown in a large skillet over medium-high heat, turning once. Cover and cook over low heat for about 10 minutes; drain.
Mix ketchup, chili sauce, brown sugar, and lemon juice. Pour the sauce over the patties. Cover and simmer for 15 minutes, basting occasionally.
Servings: 6