"Fresh tuna is marinated in a mixture of olive oil, sweet red wine, honey, lime, garlic, sweet onions, and dill. It is seared on the stove-top but can also be easily grilled. Fresh tuna can be a major investment, and it is a shame to overcook it. It should be cooked like a fine steak -- rare, medium rare, or at the most, medium. Surprisingly, when cooked properly, fresh tuna has little or no fishy taste. You can make a sauce of caramelized onions as directed in the recipe, or simply discard the marinade. Your choice, but the caramelized onions on top are delicious...."