Pesce al cartoccio (Wrapped Grilled Fish)

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Ingredients:

• Fresh tuna, one slice per person about 1" thick
• 1/2 cup balsamic vinegar
• Salt & pepper to taste
• 1 cup fresh mint leaves
• 2 tsp. dried oregano
• 2 large onions, sliced thin
• Extra-virgin olive oil

Instructions:

• Combine the vinegar, salt, pepper, mint leaves and oregano in a non-reactive pan.
• Marinate the tuna slices in the liquid for 15 minutes.
• Prepare a large piece of aluminium foil for each slice of fish, by brushing the foil with oil and lining it with sliced onions.
• Drain the fish and place each slice on a piece of aluminium foil.
• Cover with another layer of onions.
• Tightly seal the foil around each slice of fish and cook on the grill for 10-15 minutes per side, or in a 350-degree oven for 15 minutes.