Over indirect heat on your grill, or over low heat on your grill pan, grill the peaches cut side down. Be careful to make sure the heat is low enough or the sugar will burn. If you are grilling them on your bbq, set the peaches away from the flame.
Turn them over and grill for another minute or two.
These peaches are AMAZING served over ice cream, cut them up and put them in a salad, or serve alongside grilled pork or fish.