Authenticity (or the lack thereof)

Ever wondered what ingredients made their way into Indian cuisine after the discovery of the New World?

Most Indians would consider these "native" but they don't exist in 16th century cookbooks. They are all New World imports.

maize
cocoa
guavas
chillies
tapioca
peaches
walnuts
papayas
peanuts
almonds
potatoes
tomatoes
avocados
sunflower
pistachios
pineapples
cashewnuts
passion fruits
custard apples (sitaphal)
bullock's heart (ramphal)

Whither authenticity?