Trim each dacquoise layer to a perfect 8-in/20-cm round.
Smear a dollop of the ganache in the center of an 8-in/20-cm cardboard cake round and place one of the dacquoise rounds on top. Coat the dacquoise with 6 oz/170 g of the ganache. Top with a second dacquoise round and coat it with 6 oz/170 g of the ganache. Top with the remaining dacquoise round.