You will notice from what follows that herself's recipes do not err on the side of excessive precision: she writes --
QuoteEggs, chicken stock powder (or salt), pepper, soya sauce, spring onions
;D
To which she has condescended to add (after a little gentle grilling via Skype) --
Quote[19:49:18] Philip TAYLOR: I thought ham and fish sauce as well, in the authentic version 
[19:53:53] Le Khanh: No ham, you can use fish sauce instead of soya sauce
** Phil.