Teresa Tam has told the Independent Commission Against Corruption Mr Wong visited her at Emperor's Garden noodle bar on June 12 and handed her a letter to pass to her husband Ming Biu Tam.

The letter, written in Cantonese, was an instruction to Mr Tam on what to tell ICAC when he was due to appear at a private hearing later that day, specifically that he and his wife donated their own money to the Labour Party and that Mr Wong helped restaurants deal with the triads.

Ms Tam also told the hearings on Tuesday that Mr Wong, accused of seeking illegal Labor donations from banned property developer Huang Xiangmo, had told her to lie to the commission.

Ms Tam was listed as a $10,000 cash donor at a 2015 Chinese Friends of Labor dinner.

ICAC is investigating whether Mr Huang was in fact the true source of $100,000 said to be donated by 12 people in $5000 chunks at the function.

Mr Huang was prohibited from making donations to NSW political parties.

"You must insist the money donated to the Labor Party was your own money. You donated this money with your wife," Mr Wong said in the letter to Mr Tam.

"We work in restaurants, we receive lots of payments in cash, tips, lucky packet money. Our daughter will sometimes give us some money around Chinese New Year. Chinese by tradition keep money in cash at home for contingency use.

"If asked if you know Ernest Wong, Ernest Wong is a good friend of everyone in the Chinese community, everyone knows him.

"I recall the incidents when the triad gangs, blackmailing people in Chinatown for protection money ... Mr Wong assisted bosses in restaurants to seek assistance."

Ms Tam said she gave the letter to her husband some 10 minutes later and then reclaimed it, before giving it to lawyer Kevin Zhu on Monday.

In the week prior to public ICAC hearings beginning on August 26, Ms Tam encountered Mr Wong dining alone in an Emperor's Garden VIP room. She met with Mr Wong four times before August 26.

"He told me to sit down. He said he has reviewed my information and told me to answer in relation to my statement, told to tell the same lies as in the past," Ms Tam said.

Ms Tam admitted she had not made donations to the Labor Party and agreed to be listed as a donor at the behest of Emperor's Garden general manager and CFL convenor Jonathan Yee.

She said she had regretted her decision to lie to the Electoral Commission and then to ICAC, saying she felt "uncomfortable", cried often and couldn't sleep.

Fellow Emperor's Garden employee and putative Labor cash donor Wei Shi later on Tuesday told the inquiry he'd spoken with Mr Wong once before August 26, also in a VIP room at the restaurant.

Mr Wong also allegedly told Mr Wei to stick to the original story - that he had donated the money with wages and lucky money gifts.

"He told me to insist on what was said before and ICAC did not have enough evidence to prosecute me, and I shouldn't worry," Mr Wei said.

Mr Wei also admitted he was not a genuine donor.

The inquiry continues.

Australian Associated Press