TUNA OR SWORDFISH WITH ONION CONFIT

Tuna or Swordfish with Onion Confit image

Categories Onion Tuna Summer Healthy Swordfish

Yield makes 4 servings

Number Of Ingredients 7

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Ingredients

3 tablespoons extra virgin olive oil
3 large or 4 or 5 medium onions, thinly sliced
Salt and freshly ground black pepper
1 large fresh thyme sprig or a large pinch of dried
2 medium tomatoes
1 1/2 to 2 pounds tuna or swordfish
About 1/2 cup pitted and roughly chopped black olives

Steps:

Put the olive oil in a 10- or 12-inch skillet over medium heat. Add the onions, a healthy pinch of salt, some pepper, and the thyme. Cook, stirring occasionally, until the mixture starts to sizzle, a minute or two. Adjust the heat so that you have to stir only every 5 minutes at most to keep the onions from browning. They will become progressively softer; do not allow them to brown. Figure at least 30 minutes total for the onions to cook.
Core the tomatoes, then cut them in half horizontally. Squeeze and shake out the seeds, then cut the tomatoes into 1/2-inch dice. Preheat a grill to moderately hot.
When the onions are very soft, almost a shapeless mass, season the fish and grill it, turning once, for a total of about 6 minutes for tuna, 8 to 10 minutes for swordfish; check for doneness by making a small cut in the center of the fish and peeking inside. (Tuna can be quite rare; swordfish is best cooked to medium, when its interior is still slightly pearly rather than completely opaque.) While the fish is grilling, stir the olives and tomatoes into the onions and raise the heat a bit; cook, stirring occasionally, until the tomatoes liquefy and the mixture becomes juicy. Taste and adjust the seasoning. Serve the fish on a bed of the onion confit.
Variations
Chicken with Onion Confit: Serve the onions with grilled skinless, boneless chicken breasts.
Omit the thyme and use a bay leaf instead, or finish the dish with a handful of chopped fresh basil, chervil, or parsley.
Cook some finely chopped aromatic vegetables, like carrots, celery or fennel, and garlic, along with the onions.