Most people in the world have never experienced the taste of the kind of tortillas Hilda Pastor makes using heirloom corn. That's because of the rise of mass-produced instant corn flour. Marisa Peñaloza/NPR hide caption toggle caption Marisa Peñaloza/NPR The Salt Chefs' Secret For More Flavorful Tortillas? Heirloom Corn From Mexico April 13, 2017 Most tortillas in the U.S. are made with mass-produced corn flour. But specialty ingredient company Masienda is providing American chefs with heirloom corn grown in Mexico for its richer flavor.