The ACT's chief health officer has confirmed the bistro where a deadly mushroom dish was cooked on New Year's Eve would remain closed and would need to be inspected before it was allowed to reopen.

The Chinese restaurant, located in the Harmonie German Club in Narranbundah, had been due to reopen after the Christmas break on Wednesday night, just hours before management learnt of the tragic mistake, in which two people died and two others were taken to hospital after eating the dish laced with death cap mushrooms.

Canberra health authorities last night confirmed the meal was prepared in a restaurant kitchen.

Acting ACT Chief Health Officer Dr Andrew Pengilly said that, while the bistro had closed voluntarily, ACT Health had asked for it to remain shut until an inspection could be carried out.