Mash the chick peas with the onion in a large bowl until mostly smooth. I use a potato masher, but you can also pulse it in a blender of food processor. Mash in the carrots and celery, then mash in the mayo, vinegar and salt. Taste and add a drop of two more of vinegar, or another pinch of salt if it doesn’t taste like much yet.
Spoon into buns or pitas and garnish with tomatoes and lettuce.
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