Chicken Tacos With Charred Salsa

Name: Chicken Tacos With Charred Salsa
Ingredients: CHICKEN AND MARINADE:; 3 limes; 1/4 cup orange juice; 1/4 cup chopped fresh cilantro; 1 tablespoon minced garlic; 1/2 teaspoon ground cumin; 4 boneless, skinless chicken breasts (4 ounces each); CHARRED SALSA:; 8 plum tomatoes; 2 jalapeno peppers (wear plastic gloves when handling); 1/3 cup chopped scallions; juice of 1 lime; 2 tablespoons chopped fresh cilantro; 1 teaspoon minced garlic; teaspoon salt; 1 large red onion, thinly sliced; 6 whole-wheat flour tortillas (8 diameter); 3/4 cup nonfat sour cream; 2 cups finely shredded leaf lettuce