I've managed to come up with a sauce which is similar, it's still not quite right and I would appreciate tips if you have any.
Here's my recipe:
Juice a lemon.
Mix the juice with a heaped teaspoon of cornflour.
To form a paste.
Add hot water. I made half a litre.
Pour over your cooked chicken pieces and cook until hot.
Like I say. It's not the same, but I'm getting there.
Lupin Girl x