Pupusas are a traditional Salvadoran dish made of thick corn tortillas filled with various ingredients such as cheese, beans, pork, or vegetables. The dough is made of masa harina, water, and salt, which is then formed into a ball and flattened into a thick disk. The filling is added to the center, and the dough is folded and pressed to seal the filling inside. They are typically served with a side of curtido, a pickled cabbage slaw, and tomato salsa.