Wash and trim the water spinach, removing any tough stems. Cut into 2-inch lengths. Drain well.
Open the can of dace. Gently break the fish into smaller pieces with a fork, reserving the black beans and some oil from the can. Mince the garlic and slice the bird's eye chilies (if using).
In a small bowl, combine salt, sugar, oyster sauce, and water or chicken stock. Mix well.
Heat cooking oil in a large wok or frying pan over high heat until shimmering. Add minced garlic and sliced chilies. Stir-fry for 15 seconds until fragrant.
Add the drained water spinach to the wok. Stir-fry vigorously for 1-2 minutes until it starts to wilt.
Add the broken dace pieces, reserved black beans, and the seasoning sauce to the wok. Continue to stir-fry for another 1-2 minutes until the water spinach is tender-crisp and the sauce is well distributed. Serve hot with rice.
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