Everybody loves Pupusas. These corn cakes can be found in most cities across the US today, at locations known as Pupuserías. They’re one of the best street foods around, warming the belly with its signature combination of hearty corn/beans/cheese, tangy Curtido slaw, and spicy tomato salsa. The story of this dish is surprisingly complex. Pupusas were first developed in El Salvador or Honduras as far back as 2,000 years ago, and traditionally stuffed with squash blossoms or herbs. The introduction of Old World foods (mainly beef, chicken, and dairy) resulted in more elaborate preparations of this humble dish. By the mid 20th century, pupusas had spread throughout El Salvador and neighboring Honduras and Guatemala. When civil war in the 1980s displaced huge portions of the population, many Salvadorans relocated to the US, and pupusas followed. The type of corn flour used to make this dish is masa harina — ground nixtamalized corn. This is the same process that creates hominy, and masa harina can be used to make tamales, tortillas, and gorditas. Bear in mind that this is not the same as cornmeal, which is ground dried maize (i.e. hasn’t undergone the nixtamalization process) — cornmeal is what you would use to make cornbread or fried fish. Finally, masa harina is often confused with masarepa, which is the pre-cooked cornmeal that is used in making Arepas.