Experimenting with more sugar or vanilla would be a couple of ways, I'd think. Perhaps getting onto the network and seeing what recipes other people have made? If we're being honest, however, I find it plenty sweet as is and almost prefer it that way.

[while the network is one way, sizhui could also check out bookstores and libraries himself then report back with his findings. (speaking of which, he's finding all this chocolate to be richer than he'd thought, so he'll either be taking his time or saving some for later— unless wei wuxian happens to be interested?)]

Then, if I may be so bold, I would say you'd probably like the cake I make. It's just sweet enough without overpowering the vanilla.