Umeshu replaces both the mirin and the maple syrup. You get the sweet-and-sour balance with no refined sugar, the alcohol burns off instantly, and what's left is a thick glossy glaze.
why it works
Wholewheat or buckwheat noodles keep the grain's fibre intact, which slows digestion and stops the triglyceride spike you'd get from refined egg noodles. The beans thrown in at the end are the real secret weapon — a heavy dose of soluble fibre in a dish that usually has none.
Whisk the soy, plum sake, rice vinegar, honey, toasted sesame oil and chilli flakes together in a mug before the wok goes anywhere near the heat.
Oil hot, in goes the pile of garlic and ginger, and stir-fry for 30 seconds only. Burnt garlic will ruin the whole thing.
Chicken strips in, stir-frying until cooked through.
Baby corn, mangetout and stir-fry mix in. Heat to maximum and toss for 2–3 minutes so they stay crunchy rather than steaming.
Cooked noodles, spinach and the rinsed beans in, then pour the sauce over the top and toss on high for a final 60 seconds until it turns into a dark, glossy, sticky glaze and the spinach has wilted.
Use toasted sesame oil, not plain. Plain sesame oil is a neutral frying oil; toasted is pressed from pre-roasted seeds and is a finishing oil — intensely nutty and smoky, and potent enough that a teaspoon is plenty.