Tonno alla stemperata is a traditional dish originating from Sicily. The dish is usually made with a combination of tuna steaks, sultanas, garlic, celery, olive oil, olives, capers, and white wine vinegar. The sultanas are steeped in boiling water until plump and tender.

The tuna steaks are seasoned with salt and pepper, fried in olive oil on both sides, and then removed from the pan. The celery and garlic are sautéed in the same oil and mixed with the capers, olives, and sultanas. The steaks are returned to the pan and the mixture is spooned over them.

White wine vinegar is added to the pan, and everything is simmered for a few more minutes before the dish is ready to be enjoyed. Tonno alla stemperata can be served warm or cold. It's important not to overcook the steaks as they will dry out and lose the texture and flavor.