strange taxes

a random observation from my supermarket receipt: why is orange juice zero rated for vat but i have to pay tax on grapefruit and apple & mango juice? oranges are somehow more essential foods once juiced than grapefruits, apples or mangoes? i don’t pay tax on unjuiced oranges, apples, grapefruits or mangoes. all three of the cartons are from the same range, from the same fridge in the same supermarket.

my jelly tots, definitely a non essential, are also zero rated. would customs and excise rather i lived on jelly tots than grapefruit juice?