Grilled Tuna Skewers with Tomato-Black Olive Relish

Ingredients

• 1.5 pounds tuna steaks cut into 1-inch pieces ()
• 1 tablespoon pepper red crushed
• 4 large garlic cloves minced
• 2 tablespoons ground cumin 
• 3  lemons cut into 8 wedges
• 4 servings tomato-black olive relish 
• 0.3 cup oregano fresh chopped
• 0.3 teaspoon pepper freshly ground
• 3 small onions red cut into 8 (1-inch) pieces
• 0.5 teaspoon salt 

Equipment

• grill
• ziploc bags
• skewers

Directions

1. Combine first 7 ingredients in a large zip-top plastic bag. Seal, and shake well.
2. Remove tuna from bag; thread 4 tuna pieces, 3 red onion pieces, and 3 lemon wedges onto each of 8 (12-inch) skewers. Set tuna skewers aside.
3. Prepare grill.
4. Place skewers on grill rack coated with cooking spray, and grill 4 minutes on each side or until tuna is medium-rare or desired degree of doneness.
5. Serve with Tomato-Black Olive Relish.