Shrimp And Fennel Ravioli

Name: Shrimp And Fennel Ravioli
Ingredients: 1 tablespoon unsalted butter; 1/2 small fennel bulb—halved, cored and coarsely chopped, fronds chopped for garnish; 1 medium leek, white and tender green parts, finely chopped; Salt and freshly ground pepper; 12 medium shrimp, shelled and deveined, 8 shrimp cut into 1/4-inch dice; 24 round gyoza skins; 1 egg white, lightly beaten; 3 tablespoons dry white wine; 2 tablespoons minced shallots; 1/4 teaspoon finely grated fresh ginger; 1/2 cup low-sodium nonfat chicken broth; 1 1/2 teaspoons soy sauce; 1 1/2 teaspoons cornstarch dissolved in 1 tablespoon cold water; 1 tablespoon cold water; 1/4 cup snipped chives