Beef Sirloin Kebabs with Roasted Red Pepper Dipping Sauce

1 1/2 pounds boneless beef top sirloin steak,
cut 1 inch thick
2 teaspoons coarse grind black pepper
3/4 teaspoon salt
3/4 teaspoon sweet paprika
2 cloves garlic, minced
1 tablespoon olive oil
1 medium onion, finely chopped
3 cloves garlic, minced
2 (7-ounce) jars roasted red peppers, rinsed,drained, finely chopped
1/2 cup dry white wine
2 tablespoons tomato paste
3/4 teaspoon dried thyme leaves, crushed or
2 teaspoons minced fresh thyme
1 cup ready-to-serve beef broth
2 teaspoons cornstarch