Tonno alla ghiotta is a traditional dish originating from Sicily. The dish is usually made with a combination of tuna steaks, onions, garlic, tomatoes, celery, olives, capers, parsley, oregano, olive oil, red wine vinegar, salt, and pepper. The steaks are seasoned with salt and pepper and cooked in olive oil on both sides.
The tuna is removed and the celery, onions, and garlic are sautéed in the same oil until soft. The tomatoes, capers, olives, herbs, and water are added to the pan and the dish is simmered over low heat. The tomatoes are lightly mashed and the vinegar is added to the pan.