I got confused about 'neither'. In principle it should be singular (at least I was taught this way). However I found something like this (below) - can anybody confirm/deny:

P.S. Please forget the strange use of "apple" and "orange" - it's more for illustrative purposes.

1) "For this receipe, apple or orange can be used, though neither is ideal"

2) "For this receipe, apple and orange can be used, though neither are ideal"

3) "For this receipe, apples or oranges can be used, though neither are ideal"