Light a chimney 3/4 full of charcoal.

Peel and cut the sweet potatoes into 2-inch wedges or chunks.

Whisk together the apple cider, olive oil, apple cider vinegar, and brown sugar in a large bowl.

Toss the sweet potatoes with the cider mixture.

Place the potatoes and liquid in a large shallow roasting pan.

When the charcoal is fully lit and covered in gray ash, pour coals out and arrange them on either side of the charcoal grate, keeping the middle empty.

Place the roasting pan with the potatoes in the center of the grill and cover.

Cook, stirring occasionally, until the liquid has evaporated and the potatoes are browned on the edges and soft on the inside, about 45 to 60 minutes.

While still hot, season to taste with sea salt.

Serve warm.