Opera cake is a french cake , and i should have left the french cake baking to the french . I just slaughtered the cake .. LOL , anyway , it took about 3.5 hours to make this cake , to think that it’s only 10 minutes of baking .. it’s kinda ridiculous , isn’t it ? Although , you can always make them days ahead , there are few steps that can be made ahead . The coffee syrup , and the coffee buttercream can always be made a day ahead . That would save your time tremendously . I would leave the ganache and the sponge cake on…