Cover the soaked chickpeas with cold water and simmer for 1 1/2 hours then drain. Blend half of them then mix in the rest of the beans, Grana Padano, salt and pepper. Spread on a baking sheet to cool.
STEP 2
Scrape and brush the Grana Padano cheese rinds, cut them into small cubes then microwave them for 1 minute so that they will double in volume (like popcorn).
STEP 3
With the help of a pastry ring of the diameter of the buns, cut out the hamburgers from the chickpea mixture and fry them with a little oil until golden. Cut the buns in half, toast them under the grill and serve with the chickpea burger, spring leaf salad and cheese “popcorn”.