Score both sides of the cleaned dace fish. Pat dry thoroughly and season with salt and white pepper. Heat cooking oil in a large non-stick pan over medium-high heat.
Pan-fry the dace fish for 5-7 minutes per side, or until golden brown and cooked through. Carefully remove the fish from the pan and set aside on a serving plate.
In the same pan, add cooking oil. Sauté minced garlic and julienned ginger until fragrant, about 30 seconds. Add mashed fermented black beans and stir-fry for another 30 seconds.
Add diced red and green bell peppers to the pan and stir-fry for 1-2 minutes until slightly softened but still crunchy.
Pour in light soy sauce, sugar, and water/chicken broth. Bring to a simmer. Stir in the cornstarch slurry to thicken the sauce to your desired consistency.
Spoon the black bean and bell pepper sauce generously over the pan-fried dace fish. Serve immediately with steamed rice.
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