1. In saucepan, cover ancho chiles with water and bring to boil. Remove from heat; let soak 30 minutes. Remove from water; drain. Place in food processor with tomatoes and bell pepper. Purée until smooth.
2. In saucepan, combine chile-tomato mixture with onions, Anaheim chiles and garlic; simmer 15 to 20 minutes. Remove from heat; add cilantro and lime juice. Season to taste with red-pepper flakes, salt and pepper.
Sign up to receive the latest on what's cooking in leading kitchens, as well as fresh thinking about guests' favorite menu items. Once a month, we'll send you a collection of restaurant-ready recipes and menu ideas.