Stefano Brizzi, 50, is accused of murdering PC George Semple, 59, before attempting to dispose of his body in an acid bath.
PC Semple’s DNA was found on the blade of a blender, cooking pot, and other items of the defendant’s kitchen, the court has heard.
A piece of bone with bite marks was found recovered from the kitchen bun at Mr Brizzi’s home.
Prosecutor Crispin Aylett QC said: “So, the defendant cannot have confined himself to dismembering Gordon Semple and disposing of his body either by acid in the bath or else in the dustbins.”
“Instead, the prosecution suggest it would be open to the jury to find that the defendant cooked part of his body and ate it.”
The defendant said he was HIV positive and had been told by Satan to “kill, kill, kill”, jurors heard.
Mr Brizzi denies murder, claiming Mr Semple died in a “sex game gone wrong”.
But he has admitted a second charge of obstructing a coroner in the execution of their duty earlier this year.