Heat cooking oil in a wok or large pan over medium-high heat. Pan-fry tofu cubes until golden brown on all sides. Remove and set aside.
In the same wok, with a little cooking oil remaining, add minced garlic, minced ginger, and mashed fermented black beans. Sauté until fragrant.
Add Japanese pumpkin cubes to the wok. Stir-fry for 2-3 minutes.
Pour in vegetable broth, vegetarian oyster sauce, light soy sauce, and sugar. Bring to a simmer. Cover the wok and let it braise for 8-10 minutes, or until pumpkin is tender.
Add the pan-fried tofu, red bell pepper, and green bell pepper to the wok. Stir gently to combine.
Pour in the cornstarch slurry (cornstarch mixed with water) and stir continuously until the sauce thickens to your desired consistency. Drizzle with sesame oil.
Serve hot with steamed white rice.
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