Unsalted Butter • Safflower, or Corn oil • Chile Serrano, or more to taste, chopped (seeding optional for less heat) • Fresh corn kernels, from about 12 ears of corn • Water • Fresh Epazote leaves, chopped (or 1 whole leave dried, optional) • Salt; to taste • Limes, or about 4 tablespoons fresh lime juice • Mayonnaise, or Mexican cream • Crumbled Cotija, Fresco, or Añejo cheese • Dried ground chile Piquín, to taste