Ingredients
4 tablespoons olive oil
two 1-inch-thick tuna steaks
6 Kalamata or other brine-cured black olives, pitted
2 teaspoons drained bottled capers
2 garlic cloves, minced
1 teaspoon Dijon-style mustard
2 teaspoons balsamic vinegar, or to taste
1 plum tomato, seeded and chopped
1 tablespoon water
2 tablespoons finely chopped drained bottled roasted red peppers plus additional for garnish if desired
1 tablespoon finely chopped white and green parts of scallion plus additional for garnish if desired
lemon wedges as an accompaniment
Preparation
In a heavy skillet, heat 1 tablespoon of the oil over moderately high heat until it is hot but not smoking. Sear the tuna steaks, patted dry and seasoned with salt and pepper, for 1 to 2 minutes on each side, so they are still raw in the center.
Transfer the tuna to plates and wipe the skillet clean. Pour the dressing into the skillet, heat it over moderate heat until it is hot, and stir in 2 tablespoons of the roasted peppers and 1 tablespoon of the scallion. Spoon the dressing over the tuna, garnish the tuna with the additional roasted peppers and scallion, and serve it with the lemon wedges.