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The mushrooms you could buy online, but I'm pretty sure woolies had them in the Asian section, they're usually next to the seaweed sheets. 

It's pretty common to replace the sweet BEAN paste with regular ass hoisin.
Honestly the names of Chinese ingredients are very fucking unhelpful in Chinese let alone English. 

I spent weeks trying to work out which of the 25 "picked vegetables" were needed and Chang was particularly unhelpful even though i was buying his shit. 

If you've got to use "black bean sauce" mixed with hoisin you'll survive