Ash trees are pretty common in the UK, often taking up residence in newer woodlands just after birch trees have taken over a spot. Some of us will even be familiar with the seed pods - A.K.A the 'keys' - in their end-of-season form when they are dry and brown. These are blown from the tree and are carried on the wind, where they fly with a hypnotic spiraling trajectory to their new home.
These tangy pickles are actually from the very earliest stage of their growth when they are green and pleasantly crunchy. Once picked, the ash keys have been stored in a bespoke pickling liquor and matured for a year to create these incredibly more-ish little pickles. Try them wherever you would a cornichon or gherkin - alongside a cold platter works wonders but they are just as at home incorporated into a tartare sauce!