Spice up a summer meal with a grilled dish that tastes of the Caribbean islands.
Make salsa: In a medium bowl, toss together oranges, bell pepper, onion, mint, and vinegar; season with salt and pepper. Set aside.
Heat grill to high; oil grates. Rub tuna with oil, coriander, salt, and pepper. Place on grill; cook, turning once, until browned in spots but still pink in the center, 4 to 6 minutes. Serve topped with salsa. Garnish with lettuce leaves, if desired.
Slicing An Orange:With a sharp knife, slice off peel and white pith, following the curve of the fruit. Quarter each orange lengthwise. Slice orange crosswise thinly.