Grilled Shrimp with Mango and Red Onion Relish

Ingredients

• 0.3 teaspoon pepper black freshly ground
• 2 tablespoons cider vinegar 
• 0.3 cup cilantro leaves fresh chopped
• 3  garlic cloves minced
• 1 teaspoon lime rind grated
• 3 cups mangos diced peeled
• 1 teaspoon oregano dried
• 1 medium onion red cut into 1/4-inch-thick slices
• 2.3 teaspoons salt divided
• 2  serrano chiles minced
• 4 pounds shrimp deveined peeled
• 2 teaspoons sugar 
• 2 cups tomatoes seeded chopped

Equipment

• bowl
• grill
• skewers

Directions

1. Prepare grill.
2. Lightly coat onion slices with cooking spray.
3. Place onion on grill rack coated with cooking spray; grill 4 minutes on each side. Cool and chop.
4. Combine onion, mango, 1 teaspoon salt, and next 6 ingredients (through chiles) in a large bowl.
5. Combine oregano, remaining 1 1/4 teaspoons salt, pepper, shrimp, and garlic in a large bowl, and toss well. Thread shrimp onto skewers.
6. Place skewers on grill rack coated with cooking spray; grill for 2 minutes on each side or until done.