Tuna Ceviche with Coconut Milk and Ginger

Name: Tuna Ceviche with Coconut Milk and Ginger
Ingredients: 1 jalapeno chili, seeded and minced; 2 tablespoons grated fresh gingerroot; 3 tablespoons Thai or Vietnamese fish sauce; 1 tablespoon sugar; 1/2 cup freshly squeezed lime juice; 14 ounces unsweetened coconut milk (available in cans); 1 1/2 pounds fresh tuna, cut into broad slices about 1/4-inch thick, sashimi grade; 1/2 purple onion, thinly sliced; 2 tablespoons minced scallions; 1 tablespoon finely chopped chives; 3 tablespoons finely chopped cilantro leaves