Cook the lentils with a tsp of salt. Drain and let cool. Mash the hummus into the lentils - leaving some whole and mashing some to a puree. Add breadcrumbs and cumin and form into dough. If the dough is too dry add a little water if its a bit loose add some more breadcrumbs. Roll into balls and arrange on a lightly greased baking sheet(i would suggest flattening the balls for crunchier crusts). Bake at 200c for up to 20 minutes or until golden-brown. Enjoy :-).