Baked Tuna with Peppercorns Recipe

Ingredients

• 1 pound tuna loin (cross section in one piece)
• salt, to taste
• 1 tablespoon black peppercorns, coarsely ground
• 1 pound onions, thinly sliced
• 1/4 cup dry white wine
• 2 tablespoons finely chopped chives, for garnish