Technically, a taco is a tortilla folded around a filling. The tortillas were traditionally made with corn or maize, but as imports and trade along the border between Mexico and the U.S. increased, wheat flour has also been used to make tortillas. The first English recipes in cookbooks started appearing in the early 1900s. They are quite different from the modern expectations of a taco; they are, in fact, more like quesadillas in that the tortilla is folded in half, and sealed with egg, before...
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