Pupusa
A pupusa (Spanish pronunciation: [puˈpusa], from Pipil pupusaw) is a traditional Salvadoran dish made of a thick, handmade corn tortilla (made using masa de maíz, a cornmeal dough used in Mesoamerican cuisine) that is usually filled with a blend of the following:
cheese (queso, usually a soft cheese called quesillo found throughout Central America)
cooked and seasoned pork meat ground to a paste consistency (called chicharrón, not to be confused with fried pork rind, which is also known as chicharrón in some other countries)
refried beans (frijoles refritos), or queso con loroco (loroco is a vine flower bud from Central America).
The two most common pupusas are the pupusa de quesillo (cheese) and more popular pupusa revuelta with mixed ingredients of cheese, beans, and chicharrón. Pupusas are typically served with curtido (lightly fermented cabbage slaw with red chilies and vinegar).
Pupusas are similar to the South American arepa. The main differences are that pupusas are filled prior to cooking (while arepas, afterwards), and that pupusas are made from nixtamal, whereas arepas are made from ordinary corn dough. Nixtamal is basically the same corn dough, but it has undergone a preparation process involving an alkaline solution before cooking, which contributes to the peeling of the grains, making valuable nutrients available. This process was developed in Mesoamerica around 1500–1200 BCE. Early Mesoamericans used quicklime or slaked lime and ashes as the alkaline solution. Dried nixtamal is now commercially available.