Slice the gai lan stalks into thin rounds. Mix the kecap manis with 30ml (2tbsp) of the soaking liquid from the mushrooms and shrimp, add about a quarter of a teaspoon of salt and stir to dissolve.

The best restaurants have their own secret recipes for the sauce that is stirred ... dimen­sional and far too salty. I like to mix kecap manis – Indonesian thick, dark, sweet soy sauce ...

Kecap manis is available at Asian stores and some supermarkets, but it's surprisingly easy to make. If you have trouble sourcing it, I've given the very simple recipe below.

Meanwhile, heat oil in a large non-stick wok over high heat. Stir-fry onion, garlic, ginger and chilli for 1–2 minutes, until ...