Sweet and Sour Meatballs

This is also one of Brady's favorite meals, my kids also really like when I smash the meatballs over their rice. I got this recipe from Aunt Karen who said that her mom, our Grandma Melva, used to make this.
1 lb ground beef
1/2 c rolled oats
1 egg slightly beaten
1/3 c chopped onion
3/4 tsp salt, dash pepper
1 tsp worcestershire sauce
1/3 c milk
Combine ingredients, mix well. Form into 2" balls. (I use my small icecream scoop.) Place in casserole dish in single layer. Cover with sauce and bake 30 minutes @ 350. Serve over rice.
Sauce:
1/2 c brow sugar
1/4 c vinegar
1 tsp mustard
1/4 c BBQ sauce
1 tsp worcestershire sauce
Combine, heat and pour over meatballs.