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© Meredith Corporation. All rights reserved. Used with permission.
Preheat grill to medium-high.
Lightly brush bread slices with oil. Brush tuna with the remaining oil and sprinkle with 1/2 teaspoon chili powder and salt.
Grill the tuna, turning once, until cooked through, 4 to 6 minutes per side. Transfer to a clean cutting board. Grill the bread, turning once, until beginning to brown, about 1 minute per side.
Combine mayonnaise, lemon zest, lemon juice and the remaining 1 tablespoon chili powder in a small bowl. Thinly slice the tuna with the grain.
To assemble the sandwiches, spread about 2 tablespoons of the lemon-chili mayonnaise over 4 slices of bread. Top with about 3/4 cup watercress (or arugula), the tuna and the remaining slices of bread.