Honey-Glazed Chicken, Sweet Potato, And Peach Skewers

Ingredients

• 1 medium sweet potato (about 3/4 lb.), peeled and cut into sixteen 1-1/2-inch pieces
• 1 cup sherry vinegar
• 1/2 cup plus 1 tbs. honey
• 2 tbs. canola oil; more for the grill
• kosher salt and freshly ground black pepper
• 1 lb. boneless, skinless chicken breast halves, cut into 16 pieces
• 4 small ripe but firm peaches, quartered and pitted
• 1/2 small sweet onion, cut into 1-1/2-inch chunks, layers separated
• 1/2 cup pecans, coarsely chopped
• 1/2 tsp. ground cumin
• 1/2 tsp. pumpkin pie spice