Great Meatloaf from Virginia

Absolutely delicious meatloaf and sauce! Those who claim they don't believe there can be such a thing as a great meatloaf will love this.
Ingredients:

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

Directions:

Meatloaf: Combine meat loaf ingredients and place into a loaf baking dish.
Smooth out top.
Sauce: Combine sauce ingredients and pour on top and sides of meatloaf.
Bake at 350°F about 1 hour to 1 hour 15 minutes or until done.
ENJOY!
*The addition of 1 or 2 teaspoons of Kitchen Bouquet makes this recipe very good.
**Recipe should be"plump" from the addition of the milk or Half & Half.
It should NOT be runny.
***A second batch of sauce served hot is good to serve with the meatloaf.
Note: I note that some of you are using game meat such as deer -- Deer is a very DRY meat. It is wise to HAVE some fat added to the deer -- especially to ground deer. Maybe 25 % fat, ( I recommend 1 lb of ground venison, and 1/2 lb of deer sausage for fat content), otherwise your results will be poor. I don't know about some of the other game meat some are using. Please consult and expert. The recipe is delicious as it stands! Enjoy!