Grilled Tuna Sandwiches with Onions, Bell Peppers, and Chile-Cilantro Mayonnaise

Ingredients

• 20 ounce tuna steaks ( 3/)
• 0.3 teaspoon pepper black freshly ground
• 2 tablespoons cilantro leaves fresh chopped
• 1 teaspoon ground ancho chile pepper 
• 0.3 teaspoon chipotle chili powder 
• 0.3 teaspoon ground cumin 
• 4 leaf lettuce leaves red
• 1 teaspoon juice of lime fresh
• 1 teaspoon lime rind grated
• 6 tablespoons mayonnaise low-fat
• 5 teaspoons olive oil divided
• 1  bell pepper red seeded quartered
• 0.5 teaspoon salt divided
• 8 ounce sandwich buns 
• 1 inch oso sweet

Equipment

• bowl
• frying pan
• grill pan

Directions

1. Heat a grill pan over medium-high heat.
2. Combine first 6 ingredients in a small bowl.
3. Brush 3 teaspoons oil evenly over onion and bell pepper; sprinkle with 1/4 teaspoon salt.
4. Place onion and bell pepper on grill pan; cook 3 1/2 minutes on each side or until tender.
5. Remove from pan; keep warm.
6. Brush 2 teaspoons oil evenly over tuna; sprinkle with remaining 1/4 teaspoon salt, cumin, and black pepper.
7. Place tuna on grill pan; cook 3 1/2 minutes on each side or until medium-rare or desired degree of doneness.
8. Split buns in half horizontally.
9. Spread mayonnaise mixture evenly over cut sides of buns. Top bottom half of each bun with lettuce, 1 bell pepper quarter, 1 onion slice, and 1 tuna steak. Cover with top halves of buns.