Cure the beef brisket by rubbing with pastrami spice mix, salt, and sugar. Wrap in plastic and refrigerate for 24 hours
Rinse the cured beef under cold water and pat dry with paper towels
Steam the beef in a steamer basket over boiling water for 60 minutes until tender
Cool the beef and slice thinly against the grain
Mix flour, yeast, baking powder, and salt in a bowl
Add warm water and vegetable oil to flour mixture and knead until smooth dough forms, 10 minutes
Let dough rise in oiled bowl covered with cloth for 30 minutes at room temperature
Divide dough into 8 equal portions and roll each into smooth ball, let rest 5 minutes
Flatten each ball into 10cm disc with thicker edges, fold in half to create bun shape
Place each bun on parchment paper square and let proof for 15 minutes
Steam buns in steamer basket over boiling water for 12 minutes until fluffy
Brush sliced pastrami beef with sesame oil and pan-fry briefly in hot wok until edges are crispy, 2 minutes
Spread Chinese mustard inside each warm bun, layer with pastrami beef slices
Add pickled cucumbers and pickled mustard greens to each bun
Serve immediately while buns are still warm and steam is rising
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