Tonno alla Siciliana: Sicilian Tuna Recipe

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Fragrant and tasty Tonno alla Siciliana is a traditional Sicilian tuna steak served with sweet and sour onion as a main fish course or appetizer.

Prep Time15

Cook Time15

Resting time15

Keyword: Mediterranean Tuna Steak Recipe, Sicilian Tuna Steak, Tonno alla Siciliana, Tuna and Onions Recipe

Servings: people

Calories: 418kcal

Slice the onion thinly and cut the garlic into fine slices. For a milder taste, place the sliced onion in a bowl of cold water and let it soak for 10–15 minutes. This step softens their bite and makes the final agrodolce taste more balanced and delicate. After soaking, drain them well before cooking. Pat the tuna steaks dry and season lightly with salt and pepper.
4 fresh tuna steaks, 4 medium onions, 3 garlic cloves, Black pepper, Salt

Heat the olive oil in a pan over medium heat. Add the drained onions and cook gently, stirring occasionally, until it soft and slightly translucent. This should take about 8–10 minutes - don’t rush this step, as it builds the base of flavor.
4 tablespoon olive oil, 4 medium onions
Add the garlic and cook for another minute until fragrant. Then pour in the red wine vinegar and let it simmer briefly. The onions will absorb the vinegar, creating that classic agrodolce - a balance of sweet and sour flavors.
3 garlic cloves, 3 tablespoon red wine vinegar

Push the onions to one side of the pan and place the tuna steaks in. Cook for about 2–3 minutes per side, depending on thickness. The tuna should remain slightly pink in the center for the best texture.
4 fresh tuna steaks

Spoon some of the onions over the tuna and let everything cook together for another minute. This allows the flavors to come together without overcooking the fish.
Remove from heat and let the dish rest for a few minutes. You can serve it warm, at room temperature, or even cold; the flavors deepen as it sits.
lemon juice and zest, fresh parsley

Serve with fresh parsley and lemon juice and zest on top.