Peel your onions and cut them in half as equally as possible.

Prepare your meatballs how you want them--perhaps Italian seasoning, oregano, chili powder, minced garlic, ketchup, worcestershire sauce and some bread crumbs.

Size your meatballs so that they can be squished between twp pieces of onion.

Wrap each onion in tinfoil--might want to double them since the will be tossed into the fire. Don't poke holes in the foil.

Toss them into a hot bed of coals.

Cook for about 10 minutes, flip them over and cook another 10 minutes or so.