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

Ingredients

• ¼ teaspoon freshly ground black pepper
• ¼ teaspoon ground cumin
• 4 (2-ounce) sandwich buns
• 4 red leaf lettuce leaves
• 1 teaspoon grated lime rind
• ½ teaspoon salt, divided
• 1 teaspoon fresh lime juice
• + 8 more ingredients
• • 2 tablespoons chopped fresh cilantro
  • 6 tablespoons low-fat mayonnaise
  • 4 (5-ounce) tuna steaks (about 3/4 inch thick)
  • 4 (1/4-inch-thick) slices Oso Sweet or other sweet onion
  • 1 teaspoon ground ancho chile pepper
  • ¼ teaspoon ground chipotle chile pepper
  • 1 red bell pepper, seeded and quartered
  • 5 teaspoons olive oil, divided

Heat a grill pan over medium-high heat.Combine first 6 ingredients in a small bowl.Brush 3 teaspoons oil evenly over onion and bell pepper; sprinkle with 1/4 teaspoon salt. Place onion and bell pepper on grill pan; cook 3 1/2 minutes on each side or until tender. Remove from pan; keep warm.Brush ...

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