Pork-Pineapple Kebobs with Honey Chipotle Barbecue Sauce

Honey Chipotle Barbecue Sauce:

• 1 can tomato sauce 8 ounces
• 2 tablespoons brown sugar
• 2 tablespoons honey
• 1 tablespoon molasses
• Juice of 1 lemon
• 1 1/2 teaspoons Worcestershire sauce 
• 1 1/2 teaspoons prepared mustard
• 2 garlic cloves minced
• 1/4 teaspoon dried oregano
• 1 Chipotle Pepper in Adobo Sauce minced
• 1/8 teaspoon pepper

Kebobs:

• 4 6- ounce boneless pork loin chops cut into 2-inch cubes
• 1 pineapple peeled and cut crosswise into 2-inch-thick slices
• 1 red bell pepper stemmed, seeded, cut into 2-inch squares
• 1 green bell pepper stemmed, seeded, cut into 2-inch squares
• 1 red onion cut into 2-inch squares