Hi Neptune, I got your question in the Raw Feeding Group and wanted to let you know that posting your question as a discussion or in the comment section allows people to answer you. When you send it out on a group note there is no way to respond.
Anyhow, Tara doesn't like raw liver either. She will eat raw heart. So what works for us is to either grind the liver really small and mix it with other food or sometimes I just cook the liver a little bit so it is still raw on the inside. She seems to be okay with it that way too. Maybe one of those will work for Neptune. Good luck!