Check out America's First Cuisines by Sophie D. Coe. It's mainly about Prehispanic Mesoamerica and Peruvian cuisine. Basically, lots of corn. In Mesoamerica, most people mostly ate corn gruel (atole) flavored with chili, salt, beans, tomatoes, etc for the majority of their calories (just about everyone in the world ate gruel and simple carbs for most of their meals at the time). You won't find any recipes, but there are descriptions of feasts, and certain things like tamales, atole, and tortillas are made the same way (though there were a wider variety of all of these things). Something like a taco with guacamole and turkey meat (or any combination of sauces/meats made of Prehispanic ingredients) could easily have been found in a market in Tenochtitlan. Here's a list of popular street foods from Sahagun, a priest who wrote an ethnology of the Nahua shortly after the Conquest: "He sells meat tamales; turkey meat packets; plain tamales; tamales cooked in an earth oven; those cooked in an olla...grains of maize with chile, tamales with chile...fish tamales, fish with grains of maize, frog tamales, frog with grains of maize, axolotl with grains of maize, axolotl tamales, tamales with grains of maize, mushrooms with grains of maize, tuna cactus with grains of maize, rabbit tamales, rabbit with grains of maize, pocket gopher tamales: tasty--tasty, very tasty...Where [it is] tasty, [it has] chile, salt, tomates, squash seeds: shredded, crumbled, juiced. He sells tamales of maize softened in wood ashes, the water of tamales, tamales of maize softened in lime--narrow tamales, fruit tamales, cooked bean tamales,; cooked beans with grains of maize, cracked beans with grains of maize; broke, cracked grains of maize. [He sells] salted wide tamales, tamales bound up on top, [with] grains of maize thrown in; crumbled, pounded tamales; spotted tamales, pointed tamales, white fruit tamales, red fruit tamales, turkey egg tamales, turkey eggs with grains of maize; tamales of tender maize, tamales of green maize, brick-shaped tamales, braised ones; plain tamales, honey tamales, bee tamales, tamales with grains of maize, squash tamales, crumbled tamales, maize flower tamales. The bad food seller [is] he who sells filthy tamales, discolored tamales--broken, tasteless, quite tasteless, inedible, frightening, deceiving; tamales made of chaff, swollen tamales, spoiled tamales, foul tamales--sticky, gummy; old tamales, cold tamales-- dirty and sour, very sour, exceedingly sour, stinking. The food seller sells tortillas which [are] thick, thickish, thick overall, extremely thick; he sells thin [ones]--thin tortillas, stretch-out tortillas,; disclike, straight...with shelled beans, cooked shelled beans, uncooked shelled beans; with shelled beans mashed; chile with maize, tortillas with meat and grains of maize, folded...with chile--chile wrapped, gathered in the hand; ashen tortillas, washed tortillas. He sells folded tortillas, thick tortillas, coarse tortillas. He sells tortillas with turkey eggs, tortillas made with honey, pressed ones, glove-shaped tortillas, plain tortillas, assorted ones, braised ones, sweet tortillas, amaranth seed tortillas, squash tortillas, green maize tortillas, brick-shaped tortillas, tuna cactus tortillas; broken, crumbled, old tortillas; cold tortillas, toasted ones, dried tortillas, stinking tortillas. He sells foods sauces, hot sauces; fried [food], olla-cooked [food], juices, sauces of juices, shredded [food] with chile, with squash seeds, with tomatoes, with smoked chile, with hot chile, with yellow chile, with mild red chile sauce, yellow chile sauce, hot chile sauce, with "bird excrement" sauce, sauce of smoked chile, heated [sauces], bean sauce; [he sells] toasted beans, cooked beans, mushroom sauce, sauce of small squash, sauce of large tomatoes, sauce of ordinary tomatoes, sauce of various kinds of sour herbs, avocado sauce."