A wood stove for wok cooking has to handle two different jobs in the same pan: strong heat for frying, then a more restrained finish when sauce begins to coat the food. On the Hillrein Zhengtu, the last spoonful of starch slurry is a reason to watch the wok closely. Keeping the frying setting unchanged can turn a glossy sauce into a sticky patch on the bottom.
The practical skill is to separate thickening from frying. Prepare the sauce before lighting, finish the ingredients as the recipe requires, and ease the heat when the sauce starts doing its job.
Set up a wood stove for wok cooking with a finishing stage
For the main stir-fry, Zhengtu generally works well with a fuller load of dry wood around 10 cm long and about 80% fan. Fuller does not mean tightly packed: the burning fuel still needs space for air. Have the sauce, a stirring utensil, and a heatproof landing place ready before the fast cooking begins.
Use the initial high heat where it earns its keep, cooking the ingredients and recovering after food enters the pan. Do not add another substantial wood load automatically just because the meal is nearing its final step. A hot chamber with adequate burning fuel may already have more than enough heat for the sauce.
Add the thickener in small portions
If the recipe uses a starch-and-water slurry, stir it again just before adding it; starch can settle in the bowl. Add a small portion while stirring the sauce, then let it heat and judge the consistency before adding more. Follow the recipe for the starch quantity and required cooking. Dumping in all the slurry and turning up the fan at the same time makes the result harder to control.
Look for sauce that coats the food and still moves when you stir. If a utensil leaves a trail that closes slowly, the sauce has changed from the thin liquid you started with. It needs a fresh heat decision. A hard, spluttering boil is not a requirement for a glossy finish.
Reduce airflow before the bottom turns sticky
Ease the fan down in steps as the sauce reaches the desired texture. There is no universal sauce setting: a little sauce in a hot wok responds differently from a larger quantity around vegetables. Zhengtu's roughly 20% fan guidance suits established soup or slow cooking with one to two short dry pieces; it is a useful low-heat reference, not an exact finishing number for every wok.
Keep stirring across the bottom with a suitable utensil and watch the food's response. Reducing the fan does not instantly cool the metal or remove the fuel already burning. If the sauce is catching faster than the adjustment can help, move the wok to the prepared heatproof surface using appropriate heat protection. Do not carry it around looking for a place to set it down.
Why a smaller flame can still overcook the sauce
This fan-assisted wood stove sends oxygen around the burn zone through annular intake. Once the chamber is hot, gasification combustion helps burn wood gas more completely. Increasing the fan can lower the visible flame while strengthening heat under the wok. Flame height alone is therefore a poor guide to whether a thick sauce needs more heat.
About 80% fan is the practical high-heat sweet spot for much Zhengtu cooking. Running at 100% is possible but uses wood faster. Neither setting is a finishing target simply because it worked for the frying stage.
Finish the food, then end the heat
When the sauce has the texture the recipe calls for and the food is cooked, take the wok off the heat. Do not leave the finished sauce on the stove while setting the table. Next time, remember whether you needed less slurry, an earlier fan reduction, or no final refuel. Those are useful cooking notes; an exact number of seconds would not transfer reliably between pans.
Use the Hillrein Zhengtu stove outdoors according to its instructions and local fire rules. Start with dry small wood, leave the first fire loose, let the chamber warm, and increase the fan gradually. Startup and refueling can still produce visible smoke. Good wood stove fire control carries the meal through its changing stages, including the quiet final moments when the sauce comes together.