Darth Bane is presented with bloodsoup by Githany.
Bloodsoup was a type of soup frequently consumed by the Sith species as part of their customs. Some historians have put forth the idea that the Sith began this practice after their first interaction with the Anzati. Back around 28,000 BBY, Adas would consume the bloodsoup of those he defeated to properly memorialize their deaths.
During the time of the Ruusan campaign within the New Sith Wars, Darth Bane partook in bloodsoup. After he came back from Githany's failed assassination attempt, Githany gave Bane a bowl of it.
The soup that Githany offered to Darth Bane is not specifically called bloodsoup in the novel Darth Bane: Path of Destruction.