Whisk together the liquid ingredients in a nonreactive bowl. Add the shrimp to this marinade, toss to mix well, cover and rrfrigerate for 1 hour. Divide the shrimp into 4 equal portions, and thread them onto skewers. Brush shrimp with marinade. Grill over medium heat for 2 to 3 minutes on each side, turning once. Serve shrimp on a pool of Mango-Ginger Sauce or serve the sauce in separate small bowls for each diner to use for dipping the shrimp.