Cannelés of Bordeaux - A kitchen tested recipe that delivers a very good version

Anyone who has been to Bordeaux is familiar with this signature sweet. It almost defies description: a rich popover dough with a custardy interior, coated in a dark, thin, crispy caramel. It is love at first bite and the souvenir shops know this. They sell the molds. But buyer beware…insiders swear that the authentic versions can only be achieved by copper forms.