Re: What discontinued food, snack, or drink do you miss the most?
Colman's "French" Mustard.
It briefly came back as Colman's Mild Mustard, but then promptly disappeared again. Although I believe you can still get it in 2 litre catering jars, at 20 quid a pop, but they are far too big for one person to get through before the taste goes off.
So it goes.