1. Cut 10 pieces of foil into squares large enough completely to encase the peaches.
2. Mix all the ingredients except the peaches together in a bowl. Place a portion of mixture on each square of foil.
3. Roll each peach in the spiced sugar and seal them completely by folding up the foil and twisting the corners together. Cook on the barbecue for about 10-15 minutes, depending on how hot the barbecue coals are.
4. Serve in the foil.