Never miss a recipe! Subscribe to our email newsletter.

Seared Tuna With Sweet-Sour Onions

From Seafood alla Siciliana: Recipes and Stories from a Living Tradition (Lake Isle Press, 2009)

Here’s another variation on the agrodolce theme, based loosely on a recipe from Charly, chef of Taormina’s Vicolo Stretto restaurant. With red onion crowning each tuna steak, it looks pretty and makes an especially nice warm-weather dish, served at room temperature–like most sweet-sour dishes, the taste improves once the tuna and onions have had a chance to spend time together.

Serves 3-4

1 large tuna steak at least 1 inch thick (about 1 pound), cut into 3 or 4 portions
Sea salt or kosher salt
Freshly ground black pepper (optional)
5 tablespoons red wine vinegar
1 tablespoon sugar, or to taste
1 large red inion, cut pole to pole into thin wedges
Extra-virgin olive oil
Several mint leaves, snipped into ribbons

  1. Season the tuna on both sides with salt and, if using, pepper. In a small bowl, mix the vinegar, sugar and a pinch of salt with 1/4 cip water.
  2. In a heavy-bottomed skillet (such as cast iron), combine the onion with a little olive oil. Cook over medium-low heat, covered, until soft, about 10 minutes. Add the sweet-sour mixture, stirring often as the liquid evaporates and the onions begin to carmelize. Transfer to a bowl.
  3. Clean the skillet, add 1 tablespon olive oil, and raise the heat to medium. Sear the tuna until well browned. Turn the steaks and pile the onions on top. As soon as the second side is browned, reduce the heat and add a little water. Simmer a minute or so for medium rare and a little longer for medium.
  4. Transfer the tuna to dinner plates. Deglaze the pan by adding a little water and cook until thickened; drizzle over the onion-topped tuna steaks. Sprinkle with the mint. Serve warm or at room temperature.

Never miss a recipe! Subscribe to our email newsletter.

Subscribe To The Italian Chef Newsletter

Join our mailing list to receive the latest recipes and updates.

Thank you! Please check your email and confirm your subscription.