 This sandwich is called "sánguche de milanesa" or "milanga" in Tucumán, and is sold in "sangucherías" and food carts.Sangucherías are a type of fast food restaurant that sells milanesa sandwiches, along with other types of sandwich such as "lomito"(which is almost identical to the Milanesa sandwich, but replaces the milanesa with a thin rib steak fillet, hence the name "lomito", which is the name of that cut in Spanish).Sangucherías do not usually form fast food chains, although there are a few exceptions.