Ah, yes, it all comes back to me now. Queen Elizabeth fancied an Indian takeaway so Walt thought he'd try out a new short cut by going the other way around. He sailed up to Manhattan, and the silly fellow thought he'd arrived in India. When they inexplicably refused his credit card he had to trade beads for those strange looking chapatis and papadums.
Without proper spices, well of course it would all be inedible when he got back! Easy to appreciate why she threw her glass of Coke over him; even the corgis turned their noses up at the stuff! Thus (without the royal endorsement) pizza took a good while to catch on. History is so interesting I don't know why they no longer do the real thing in schools these days.