Thats wild, I'm used to zero rating on basic food goods in the UK. Unless its chocolate. That's taxable. Unless its a chocolate cake, thats a basic food again. But a chocolate biscuit attracts tax. Which was the whole thing about jaffa cakes and their tax status was about. Its a cake, therefore a basic food.

Catering, Alcohol, confectionary, crisps and snacks, hot food, sports drinks, ice cream and soft drinks are taxed.

Its all a bit complicated, but the more you can imagine someone eating it in 1910 the more likely its zero rated.