It's not often that buying biscuits feels like going to confession, but step into the vestibule of this ancient convent (if you find it open), push a bell, and a concealed nun on the other side of a wooden partition will invite you to buy a bag of sweet treats (€3 to €7.50). Place your money in a revolving compartment, and within a couple of minutes it will flip back round with your order on it.
