1. Preheat barbecue to high. 
2. Combine barbecue sauce with chipotle sauce in a bowl. Add shrimp and turn to coat evenly. Build skewers, alternating shrimp, onion, and mango. Finish each skewer with a slice of lime. Lightly brush skewers with canola oil and season with pepper.
3. Grill for 2 to 3 minutes per side, just until the shrimp turns opaque. Remove from heat. Sprinkle with green onion and cilantro to serve.

Chef’s secret

Soak wooden skewers in water for 30 minutes before using.