Put the shallots, celery, fennel and fennel mayonnaise into a large bowl and mix together. Grate the apple and mix through; add the currants, mix and season to taste.
Add the mint and mix through. Store tightly packed into airtight food containers in the fridge. Good shelf life 3-5 days if it lasts that long!
[1] We didn’t have currants and used finely chopped Arancia instead and have to say it was delicious!