Mackerel in White Wine

• 2 pounds small (Boston) mackerel, cleaned, heads removed, rinsed, left whole if no more than 6 inches long, cut into 2-inch lengths if larger
• 1 tablespoon olive oil

Arrange the mackerel in a large oiled saucepan or plat à sauter. In another saucepan bring the white wine to a boil, add all the other ingredients except the peppercorns, and simmer, covered, for about 15 minutes. Add the peppercorns, pour the boiling liquid over the mackerel, return it to a boil, and maintain at a bare simmer, covered, for 10 to 12 minutes. Transfer the fish to a non-me