1 1⁄2 lbs ground beef (ground shoulder roast is good)
1 slice bread (broken or chopped finely)
1 egg
1 small vidalia onions or 1 small type sweet onion, finely chopped
1 teaspoon table salt
1⁄4 teaspoon black pepper
4 tablespoons ketchup
1⁄2-2⁄3 cup whole milk or 1⁄2-2⁄3 cup half-and-half

Sauce
4 tablespoons apple cider vinegar
2 -4 tablespoons dark brown sugar, packed firm (to taste)
1⁄2 cup ketchup