Ingredients

For the Savory Yaki Udon Sauce:

1/4 cup low-sodium soy sauce (or tamari for gluten-free): The foundational element, providing salty, umami depth. Low-sodium is crucial to control the final saltiness of the dish.
2 tablespoons mirin: A sweet Japanese rice wine that is essential for the sauce’s signature sweet-savory balance. It adds a beautiful gloss and authentic flavor.
2 tablespoons oyster sauce: This thick, rich sauce adds a complex, savory, and slightly sweet flavor with incredible depth. For a vegetarian version, you can find mushroom-based “oyster” sauce.
1 tablespoon brown sugar (packed): Complements the mirin and balances the saltiness of the soy sauce, adding a hint of molasses flavor that deepens the sauce.
1 teaspoon sesame oil: A finishing oil added for its rich, nutty aroma and flavor. A little goes a long way.
1 teaspoon cornstarch: A small amount whisked into the sauce helps it thicken slightly when heated, allowing it to cling perfectly to every noodle and piece of beef.

For the Beef and Noodles:

1 lb fresh or frozen udon noodles (two 8-ounce packages): The star of the show. Frozen sanuki-style udon noodles are highly recommended as they have a superior chewy and bouncy texture. Vacuum-sealed, pre-cooked udon noodles are also a great, convenient option.
12 oz beef sirloin, ribeye, or flank steak: Choose a tender cut of beef. Ribeye is fantastic due to its marbling, which keeps it juicy, but sirloin is a leaner, excellent choice. The key is to slice it very thinly against the grain.
1 tablespoon soy sauce: For marinating the beef.
1 teaspoon cornstarch: To coat the beef. This helps create a velvety texture and gives the beef a slight crust when seared.
1 tablespoon vegetable or canola oil: For searing the beef.

For the Vegetable Stir-Fry:

1 tablespoon vegetable or canola oil: A high-smoke-point oil for stir-frying.
1 medium yellow onion, thinly sliced: Forms the aromatic base of the stir-fry.
2 cloves garlic, minced: Adds essential pungent, aromatic flavor.
1 teaspoon fresh ginger, grated: Provides a warm, zesty spice that brightens the entire dish.
2 medium carrots, julienned or thinly sliced on a diagonal: Adds sweetness, color, and a nice crisp-tender texture.
4-5 shiitake mushrooms, stemmed and thinly sliced (optional but recommended): Shiitake mushrooms add a deep, earthy, umami flavor that beautifully complements the beef and sauce.
1/4 head of green cabbage, thinly shredded (about 3 cups): Cabbage adds bulk, a subtle sweetness, and a lovely texture that wilts down but retains a slight crunch.
2 green onions (scallions), sliced on a diagonal, green and white parts separated: The white parts are cooked with the other aromatics, while the green parts are used for a fresh garnish at the end.
Katsuobushi (bonito flakes) and Beni Shoga (Japanese pickled red ginger), for garnish (optional): These are traditional garnishes that add a final layer of authentic flavor—smoky umami from the bonito flakes and a sharp, tangy bite from the pickled ginger.

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Instructions

Step 1: Prepare the Udon Noodles

Your first step is to get the udon noodles ready. This method will vary slightly depending on the type you are using:

For Frozen Udon: Bring a pot of water to a boil. Add the frozen udon blocks and cook for just 1-2 minutes, or according to package directions. They are done as soon as they separate and are pliable. You are just loosening them, not cooking them through. Drain immediately and rinse briefly under cold water to stop the cooking process. Set aside.
For Vacuum-Sealed (Pre-cooked) Udon: These noodles are already cooked. You can either place the package in a bowl of very hot water for a minute to help loosen them, or simply add them directly to the wok at the end of the cooking process, using your chopsticks or tongs to gently separate them in the pan.

Step 2: Prepare the Beef and Sauce

Place your thinly sliced beef in a medium bowl. Add 1 tablespoon of soy sauce and 1 teaspoon of cornstarch. Toss with your hands or tongs until the beef is evenly coated. Set aside to marinate while you prepare the other ingredients. In a separate small bowl or liquid measuring cup, whisk together all the sauce ingredients: 1/4 cup soy sauce, mirin, oyster sauce, brown sugar, sesame oil, and the remaining 1 teaspoon of cornstarch. Whisk until the sugar and cornstarch are fully dissolved. Set this sauce mixture near your stove.

Step 3: Sear the Beef

Place a large wok or a 12-inch skillet over high heat. Allow it to get very hot. Add 1 tablespoon of vegetable oil and swirl to coat. Carefully add the marinated beef to the pan in a single layer. Do not overcrowd the pan; cook in two batches if necessary to ensure a good sear rather than steaming the meat. Cook for 1-2 minutes per side, until browned and just cooked through. The high heat will cook it very quickly. Remove the seared beef from the wok and set it aside on a plate.

Step 4: Sauté the Aromatics and Vegetables

Reduce the heat to medium-high. Add the remaining 1 tablespoon of oil to the same wok. Add the sliced yellow onion, the white parts of the green onions, and the carrots. Stir-fry for 2-3 minutes until the onions begin to soften. Add the minced garlic and grated ginger and continue to stir-fry for another 30 seconds until fragrant.

Step 5: Cook the Remaining Vegetables

Add the sliced shiitake mushrooms (if using) and the shredded cabbage to the wok. Continue to stir-fry, tossing everything constantly, for another 3-4 minutes. The cabbage will wilt down significantly, and the mushrooms will become tender. You want the vegetables to be tender but still have a bit of a crisp bite.

Step 6: Combine, Sauce, and Serve

Pour the prepared Yaki Udon sauce over the vegetables in the wok. It will bubble and begin to thicken almost immediately. Add the prepared udon noodles and the cooked beef back into the wok. Use tongs or long chopsticks to gently toss everything together, ensuring the noodles, beef, and vegetables are all thoroughly coated in the savory sauce. Continue to toss for 1-2 minutes, until the noodles are heated through. Remove from the heat.

Step 7: Garnish and Serve

Divide the Beef Yaki Udon into serving bowls. Garnish generously with the sliced green parts of the green onions. For the most authentic experience, add a sprinkle of toasted sesame seeds, a pinch of Katsuobushi (bonito flakes)—which will “dance” from the heat of the noodles—and a small pile of Beni Shoga (pickled red ginger) on the side. Serve immediately while hot.

Nutrition

Serving Size: one normal portion
Calories: 650-750 kcal