Poblano peppers are a type of chili pepper native to Mexico that are often used to add zing to a meal. They are green like most other chili peppers. They are larger than Jalapeno peppers but smaller than bell peppers. Fresh Poblanos have a mild and slightly sweet flavor. When allowed to ripen and turn red, they become more intense and spicy. Dried Poblano peppers that have reached maturity and turned a deep red color are called ancho peppers. Ancho peppers are a very popular ingredient in Mexican dishes and sauces.