For the bao dough, combine the flour, yeast, and sugar in a bowl, then add the lukewarm water. Knead until smooth, cover, and let rise in a warm place for 1 hour, or until doubled in size.
Divide the risen dough into 8-10 portions, shape into ovals, fold in half, and place in a steamer lined with parchment paper. Steam for 10-12 minutes, until the dough is springy and cooked through.
In a skillet, heat the cooked, shredded beef with the mustard, honey, garlic, and sesame oil. Cook, stirring, for about 6-8 minutes, until the sauce coats the meat and lightly caramelizes.
Carefully open the bao buns. Spoon in the mustard-glazed beef filling, add cucumber slices, and sprinkle with fresh, finely chopped green onions.
Serve immediately while warm. You can offer extra mustard or a slightly spicy sauce for an even more exciting flavor experience.
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