Shortly after fatally stabbing her boyfriend, an Australian woman sent a text message to another man asking him whether he would like to join in to eat the 'delicate meat' because 'I think he tastes good', a court was told.

Thirty-year-old David Vaughan suffered 16 stab wounds to his neck, six to his chest and four to his abdomen during the knife attack by his girlfriend of three months at her apartment Dec 25, 2008.

Tamie Melehan admitted to killing her boyfriend but pleaded not guilty to murder by reason of mental illness in the NSW Supreme Court Monday, Australian news agency AAP reported.

Melehan, 29, has a history of mental illness and was diagnosed with paranoid schizophrenia in 2002, the court was informed.

She sent another man text messages and invited him over to feast on her boyfriend's 'delicate meat', Prosecutor Michael O'Brien said.

'Oi, can I eat this fella?' she said.

'I think he tastes good ... there's enough to go around if you want to join in - no joke, delicate meat ...

'Dear me, need help to get rid of the body.'

Later she called up her mother and said: 'Can you come over and get him before I slit his throat?'

Melehan's mother, Loretta Watts, reached Melehan's home to find Vaughan dead on the floor of the shower with blood pouring out of a slash wound in his neck.