Line a sheet pan with parchment paper. In a mixing bowl, add the lamb, onion, salt, pepper, cardamom, and saffron-rose water. Mix lightly using two forks. Add the chickpea flour, a little at a time, and continue to mix until all the chickpea flour has been absorbed (do not overmix). Shape the mixture into walnut-sized meatballs and arrange on the sheet pan. Set aside.