Cut 250 g boneless chicken thigh into bitesize pieces, then sprinkle with ⅛ tsp salt and ½ tbsp all-purpose flour. Toss until evenly covered, then cover and refrigerate while you prepare the other ingredients.
Thinly slice 50 g onion and 2 fresh shiitake mushrooms, and julienne ½ carrot and ½ bell pepper. Chop 150 g green cabbage into rough bitesize pieces and set by the stove.
Heat a wok on medium low and melt 1 tsp butter and 1 tsp lard. Grate 1 clove garlic and 1 tsp ginger root straight into the wok, add the onion and fry for 3 minutes or until fragrant and the onion has slightly softened.
Push the onions and aromatics to one side and increase the heat to medium. Place the chicken pieces in the wok in a single layer with the skin side facing down and fry undisturbed. Once golden and slightly crispy, flip and sear on the other side.
Once the chicken is seared all over, add the cabbage, carrot, bell pepper and mushrooms. Immediately pour in 1 tsp dashi granules, 1 tsp mirin, ½ tsp oyster sauce and ¼ tsp sugar. Stir fry everything together until the condiments are evenly distributed and the vegetables are tender-crisp.
Increase the heat to high and add 2 portions udon noodles. Mix and toss until the ingredients are evenly distributed, then pour ½ tbsp Japanese soy sauce (koikuchi shoyu) around the edge of the pan.
Turn off the heat and add ½ tbsp butter and ¼ tsp balsamic vinegar. Toss a few times to distribute.
Plate up and garnish with ground black pepper, toasted white sesame seeds, kizami nori (shredded nori) and optionally, a drizzle of chili oil (rayu). Enjoy!
Notes
Loosen Udon Before the Pan. Microwave frozen or refrigerated noodles for about 3 minutes, or drop them in boiling water. Adding them straight from the package floods the pan with ice water and you end up steaming instead of searing.Soy Sauce Hits Metal, Not Food. Pour the soy sauce around the pan edge so it contacts bare hot metal. A sharp hiss and a roasted, almost sweet smell mean the pan is hot enough.Finish Off the Heat. Turn the burner off before adding the cold butter and balsamic vinegar. Cold butter melts into a glossy coating at residual heat.Fry the chicken undisturbed. The flour coating needs uninterrupted contact with hot metal to form a golden crust. If you lift a piece and the coating stays stuck to the pan, it is not ready.One to Two Portions Per Batch. A crowded pan drops temperature fast enough that nothing sears. The noodles steam instead of frying and the whole dish turns soggy.