Place an 8-in/20-cm cake ring on an 8-in/ 20-cm cardboard cake round. Trim the sponge to a 7½-in/19-cm round. Slice the sponge into two even layers between ¼ and ½ in/0.6 cm and 1 cm thick. Place one of the sponge layers in the bottom of the mold and moisten with simple syrup.
Line the inside of the ring with the ladyfingers, flat side facing in. Ladle the choc