1. Lightly brush the peaches, pineapple and bread on both sides with a little of the oil.
2. Wash chicken and dry; brush lightly on both sides with remaining oil.
3. Prepare and heat grill.
4. Grill chicken 10 minutes total, turning once.
5. Grill pineapple and peaches.
6. Mix orange rind with mustard. Brush on bread. Top with chicken, peaches and pineapple.