Heat vegetable 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.
Add minced garlic and ginger to the same wok, stir-fry until fragrant (about 30 seconds).
Add diced preserved Szechuan vegetable and sliced shiitake mushrooms, stir-fry for 2-3 minutes.
Return the fried tofu to the wok. Add water/mushroom soaking liquid, light soy sauce, dark soy sauce, sugar, and white pepper. Bring to a simmer.
Cover and braise for 10 minutes, allowing flavors to meld.
Stir in the cornstarch slurry to thicken the sauce to your desired consistency.
Drizzle with sesame oil (if using) and garnish with chopped spring onion before serving.
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