Trim asparagus ends and cut into 5cm lengths. Wash and trim choy sum, keeping stems intact.
Slice garlic thinly. Remove seeds from dried red chilies and cut into rings.
Heat vegetable oil in a wok over high heat until shimmering.
Add garlic and dried red chilies, stir-fry until fragrant.
Add asparagus and choy sum, toss continuously for 3-4 minutes until just tender.
Add light soy sauce and sesame oil, toss well to combine.
Transfer to serving plate and sprinkle white sesame seeds on top.
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