1 small yellow summer squash, cut into 1/2-inch slices
1/2 medium green pepper, cut into 1-inch pieces
1/2 sweet onion, cut into 4 wedges
In a small bowl, combine the first nine ingredients. Divide marinade between two large bowls. Add pork to one bowl and vegetables to the other; turn to coat. Cover and refrigerate for 2 hours.
Drain and discard marinade. On four metal or soaked wooden skewers, alternately thread pork, squash, green pepper and onion. Grill, covered, over medium heat or broil 4-6 in. from the heat for 5-8 minutes on each side or until pork juices run clear.