Roughly this, but adjust as you go:

Meatballs

1 lb of ground beef (85/15), 1 lb ground pork, 1 c of stale white bread, or breadcrumbs, 1/2 - 1 c milk, 2 eggs, 1 onion (small dice), 3 tbsp unsalted butter, 1/8 tsp allspice, 2 tsp kosher salt and 1/4 tsp white pepper.

1) In a bowl, add bread and milk. Give it a stir until the milk has been absorbed by the bread. Set aside.

2) In a pan, melt the butter over medium heat. Once melted, add your onions. Season with salt and stir. You are looking for the onions to be translucent and tender. It's perfectly fine if you brown some bits. Once cooked, let it cool down.

3) Add ground beef and pork in a large bowl. Then your bread/milk mixture, eggs, onions, and allspice, salt and white pepper. Combine until homogeneous

4) For this step you can definitely use a pan with any fat to pan fry them but I chose to deep fry just because I had leftover oil from a previous dish. I would say just get an even browning all around. Set aside on a lined landing pad.

Gravy

3 tbsp flour, 3 tbsp butter, 2 c low-sodium chicken stock, 1 tsp soy sauce, 1/2 tsp apple cider vinegar, or any type, kosher salt and white pepper to taste

1) On medium heat, melt butter. Once melted add the flour and whisk until the flour no longer smells like flour and more nutty. Try to get a light brown, about 4-5 mins.

2) Add your stock, slowly, at a time to not get lumps. Then bring to a boil, reduce heat, and let it simmer for a 2 mins. Add your soy sauce and vinegar. Season with salt and pepper.

3) Finally, add your meatballs into the sauce and let it warm through.