Once the meatballs are out of the oven, it's time to make the gravy.
Melt the butter with the onions in a deep, large skillet on medium heat. If you don't have one large enough you can use 2. Because of this you will end up using 4 tbsp of butter, 2 in each skillet. Then half the onion in each skillet.
Add beef broth and milk
Slowly stir in the flour mixing as not to get clumps..
Slowly stir in the flour mixing as not to get clumps..
Put the meatballs in the gravy.
Cook on low for 15-20 minutes until cooked all the way through but still tender.
Remove meatballs to your serving platter (or crockpot if you are serving later or taking to a potluck.)
Add in the sour cream.
Pour over the meatballs.
Serve with mashed potatoes and green beans and a large tablespoon full of Lingonberry or red current jelly.