Queso Fresco is a white, mild, fresh Mexican cheese with the texture of fresh farmer's cheese in the US. Queso fresco can be found in many supermarkets, or can also substituted with a mild feta cheese. The pasilla is a Mexican dried chile, also known as "ancho" or "chile negro" in the U.S. It is often used in moles and other Mexican sauces. It also can be sold as a fresh chile in the U.S. similar to the poblano. They can be found at most supermarkets, Latin specialty markets or online. Ibarra chocolate is a brand of Mexican chocolate that can be purchased in most national supermarkets. If you cannot find Ibarra or any Mexican chocolate, you can substitute one ounce of Mexican chocolate for: 1 ounce of semi-sweet chocolate, 1/2 teaspoon ground cinnamon and one drop of almond extract.