Heat grill to MEDIUM-HIGH heat.
Combine olive oil, grated lemon rind, salt, pepper, and minced garlic in a large bowl, stirring well.
Add pork and marinate at room temperature for 15 minutes, tossing occasionally.
Thread pork and bell peppers alternately onto each of 8 skewers. Coat grill racks with olive oil.
Place skewers on grill and cook 10 minutes or until pork is done, turning occasionally.
Serve skewers and chard together warm.