Follow these step-by-step instructions for a flawless stir-fry. The key to success is having all your ingredients prepped and ready to go before you even turn on the stove—a practice known as mise en place. Stir-frying is a fast process, and you won’t have time to chop vegetables once the cooking begins.

1. Prepare the Udon Noodles: Cook the udon noodles according to the package directions. This usually involves a brief boil for 1-3 minutes until they are just tender. If using frozen udon, you can often run them under hot water or microwave them for a minute to loosen them up. Once cooked, drain them immediately and rinse with cold water to stop the cooking process and prevent them from sticking together. Set aside.
2. Mix the Sauce: In a small bowl, whisk together the low-sodium soy sauce, mirin, and oyster sauce. In a separate, even smaller bowl, mix the cornstarch with the 2 tablespoons of water until it’s completely dissolved, creating a smooth slurry. Set both the sauce mixture and the slurry aside near your stove.
3. Heat the Wok or Pan: Place a large wok or a heavy-bottomed skillet over high heat. Let it get very hot—you should feel a wave of heat rising from the surface when you hold your hand a few inches above it. Add the 2 tablespoons of neutral oil and swirl to coat the bottom of the pan. The oil should shimmer slightly when it’s ready.
4. Sauté the Aromatics: Add the minced garlic, grated ginger, and the white parts of the scallions to the hot oil. Stir-fry continuously for about 30 seconds until they are incredibly fragrant. Be careful not to burn the garlic, as it will become bitter.
5. Cook the Harder Vegetables: Add the broccoli florets and the carrots to the wok. These vegetables take the longest to cook. Stir-fry for 2-3 minutes. The broccoli should turn a vibrant green, and the carrots will begin to soften slightly but still retain a bite. You can add a tablespoon of water and cover the pan for a minute to help steam the broccoli if you prefer it more tender.
6. Add the Softer Vegetables: Add the sliced red bell pepper and shiitake mushrooms to the pan. Continue to stir-fry for another 2-3 minutes. The goal is to have all the vegetables be “crisp-tender”—cooked through but still with a definitive crunch. The mushrooms will have released some of their moisture and become tender.
7. Combine and Sauce: Push the vegetables to the sides of the wok, creating a well in the center. Pour the sauce mixture (soy sauce, mirin, oyster sauce) into the center and let it bubble for about 15-20 seconds. This brief moment of direct heat helps to caramelize the sugars in the sauce and deepen its flavor.
8. Thicken the Sauce: Give your cornstarch slurry a quick re-stir (as the cornstarch will have settled) and pour it into the bubbling sauce in the center of the wok. Stir immediately. The sauce will thicken into a beautiful, glossy glaze within seconds.
9. Add the Noodles: Add the prepared udon noodles to the wok. Use tongs or chopsticks to gently toss everything together, ensuring the noodles and vegetables are thoroughly coated in the luscious sauce. Continue to toss for 1-2 minutes until the noodles are heated through.
10. Final Touches and Serve: Remove the wok from the heat. Stir in the teaspoon of toasted sesame oil and the green parts of the chopped scallions. Give it one final toss to distribute the flavors. Serve immediately in large bowls, garnished with any desired toppings.