Australian woman Erin Patterson is on trial accused of killing three relatives and seriously injuring another by serving a lunch containing poisonous mushrooms

The prosecution says Ms Patterson, 50, served beef wellington and ate from a smaller and different coloured plate from her four guests - with one guest later asking "does Erin have a shortage of crockery?"

Ms Patterson had previously written on Facebook that she had been using a food dehydrator to cook mushrooms and "hiding powdered mushrooms in everything", the court hears

The defence says it accepts death cap mushrooms were in the meal but that the poisoning was a "terrible accident" and Ms Patterson "didn't intend to cause anyone any harm"

Ms Patterson, 50, is facing three murder charges and one count of attempted murder - all of which she denies

The parents of her estranged husband, Don and Gail Patterson, both died as well as Gail Patterson's sister, Heather Wilkinson. Heather's husband, Ian Wilkinson, became ill but survived