You can always dig a small hole as well and fill it with charcoal or wood and lay an oven grate over it. Just turn often to avoid burning and drying out the meat.
Years back I attended a backyard party of some church friends. They’d dug a hole and put one of those large disposable aluminum turkey roasting pans in it, filled it with charcoal, and made their own grill that way.
You can always dig a small hole as well and fill it with charcoal or wood and lay an oven grate over it. Just turn often to avoid burning and drying out the meat.
Years back I attended a backyard party of some church friends. They’d dug a hole and put one of those large disposable aluminum turkey roasting pans in it, filled it with charcoal, and made their own grill that way.
You don't even have to dig a hole. That's my go-to for cooking burgers and dogs on the riverside.