Complete the food critic's dramatic review of a local restaurant.

I tasted the chocolate cake and the lemon tart, but unfortunately, ___ of them was edible.

The correct answer is neither.

We use neither to mean "not one and not the other" when talking about exactly two things.

"Both" doesn't fit the negative context ("unfortunately"), "either" would need a negative verb ("wasn't"), and "none" is only used when talking about three or more items!