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
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Janet Stein Romero of El Ancon, N.M., shapes the dough before rolling out flour tortillas. Tracie McMillan for NPR hide caption
A package of corn tortillas listing propylparaben as an ingredient. Meredith Rizzo/NPR hide caption