In a large bowl, mix together the ground beef, egg, water, bread crumbs, and minced onion. Roll into small meatballs. Bake at 350F for 20 to 25 minutes, turning once. In a slow cooker or large saucepan over low heat, blend the cranberry sauce, chili sauce, brown sugar, and lemon juice. Add meatballs and simmer for 1 hour before serving.