Andrew Chimboza, 35, who runs a window tinting business, pleaded guilty to murdering Mbuyiselo Manona, 62, in the South African township of Gugulethu last year.
He told police after he was arrested that he gouged out Mr Manona's heart and ate it as he lay bleeding to death 'to show him that I am not a moffie [gay]'.
'I then took a knife and slit his throat and continued to stab him.
'I was so angry that I did not remember how many times I stabbed him or where.'
In his plea explanation, Chimboza later claimed Mr Manona attacked him in a jealous rage after accusing him of sleeping with his girlfriend.
He then explained he stabbed him and chopped out the man's heart because it was 'full of hatred and jealousy'.
He said: 'I do not know why I ate it and I accept my actions were wrong and exceeded the boundaries of self-defence.'
Prosecutor Jacqueline Sibiya said: 'Because the removal of the heart was not the cause of death per se, it does not therefore have too much bearing on the plea of murder. 'It is nonetheless very disturbing.'