What prayer is most appropriate for a vampire to say after their meal?

So me and my friend were talking. We play TTRPGs together and he is playing a devoutly jewish vampire (we are both jewish too) born in the early 1800s but the campaign takes place in the present day. He was thinking that it would be real fun that his character has a stipulation that he has to say the Birkat Hamazon after feeding since its a meal (since it very long it adds an interesting role playing element). But I countered that there’s not really bread there and we fell down a rabbit hole.

So I’m posing the question the internet. This is more of a thought experiment as opposed to a serious question (obviously).