Finley slice a small onion and place in a bowl. Cover with lemon juice and leave to soke.
Grate a carrot and place on top.
Chop a stick of celery and add to the bowl.
Chop an apple into matchsticks and roll in lemon juice to stop it discolouring and add to the bowl.
Add a generous dollop of mayonaise and some oil.
Season with salt and pepper and combine.