Our best-selling Heirloom Blue Corn Masa Harina is a fine-ground nixtamalized corn flour perfect for making not just tortillas but also other favorites like tostadas, tamales, pupusas, arepas and more. Its deep flavor comes from high quality heirloom corn, which is cooked, slow dried and milled to perfection in small batches. Never genetically modified. Always gluten-free.