Place the garlic, chilli, coriander leaves and cumin seeds in a food processor and whizz until finely chopped then add the beans and whiz again to form a coarse puree.
Add the breadcrumbs, mozzarella, egg yolk and some salt and pepper and pulse together to form a stiff paste.
Shape the mixture into two even-sized cakes and shallow fry for 3 to 4 minutes on each side until golden – the cheese may ooze out and make them stick a little so make sure you use a good non-stick pan.
Drain on kitchen paper and serve in fresh crusty buns with a few slices of tomato, red onion rings and a good dollop of mayonnaise and some rocket salad.