Chewy udon noodles stir-fried with tender leafy greens and fried tofu balls in a savory sauce. This easy vegetable tofu udon stir-fry is ready in just 20 minutes using one pan! I briefly soak the udon noodles in boiling water before stir-frying so they stay chewy and bouncy.
In a small bowl, combine all the noodle sauce ingredients and mix until the sugar fully dissolves. Set aside.
Place the udon noodles in a large heatproof bowl and cover with boiling water. Let sit for 20-30 seconds, or until loosened. Gently separate the noodles with chopsticks or tongs, then drain immediately.
Heat vegetable oil in a large pan or wok over medium heat. Add the green onions and garlic, and stir-fry for about 10 seconds until fragrant.
Add the yu choy sum, baby bok choy, and fried tofu balls. Stir-fry for 2-3 minutes until the leaves have wilted and the stems are crisp-tender.
Add the drained udon noodles and the noodle sauce. Toss until everything is evenly coated and heated through. Serve immediately.
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