Sweet and Sour Meatballs

I found yet another "keeper" and thought I'd pass it on...
Sweet and Sour Meatballs
Source: My Kitchen Cafe
Serves 4-6
1 1/2 pounds lean ground beef (make sure it's REALLY lean, I use elk meat, and it works great)
3/4 cup quick oats
2 eggs, slightly beaten
1/2 cup finely chopped onion
1/2 cup milk1 teaspoon salt
1/2 teaspoon pepper
1 teaspoon Worcestershire sauce

Combine all of the ingredients and mix well. Form into about 12 balls, each about 2 inches in diameter. Place in a casserole dish. Cover with sauce (below). Bake at 350 degrees for about 30 minutes. Serve over rice.

Sauce:
1/2 cup brown sugar
1/4 cup apple cider vinegar
1 teaspoon mustard
1/4 cup barbecue sauce
1 teaspoon Worcestershire sauce

Combine ingredients and blend thoroughly. Heat in a small saucepan until combined and sugar is dissolved and pour over meatballs. (This dish is not overly abundant on sauce so if you enjoy things a bit saucier, double the sauce ingredients. ***I actually triple it, but save about a third to pour on meatballs when there is about three minutes left of cooking time. This way the sauce doesn't get hot enough to caramelize into the yummy stuff that coats the meatball, leaving it a tad bit runny to pour on our rice!)