Duck Confit Tacos

Name: Duck Confit Tacos
Ingredients: 1 large poblano; 1/2 pound plum tomatoes; 1/4 pound tomatillos, husked; 1 large garlic clove, unpeeled; 1 fresh red chile, seeded and chopped; 1 large scallion, chopped; 2 teaspoons fresh lime juice; Salt; 4 confit duck legs; 1/2 cup low-sodium chicken broth; 3 tablespoons soy sauce; 1/2 teaspoon Chinese five-spice powder; 8 corn tortillas, warmed; Cilantro sprigs, for serving