- Preparation: Finely chop the dried shallots and ginger.
- Sauté aromatics: Heat oil in a large pot, add the shallots and ginger, and sauté over medium heat until fragrant and lightly golden.
- Add Shaoxing wine: Pour in Shaoxing wine, increase the heat to high. Bring to a boil, scraping the bottom of the pot with a wooden spoon. Simmer until the wine reduces by about one-third to evaporate the alcohol and concentrate the flavors.
- Cook the sauce: Lower the heat, add chicken stock and Blue Band Multipurpose Cream. Add soy sauce, rock sugar, five-spice powder, and char siu sauce. Stir until the sugar dissolves.
- Simmer: Let it simmer gently for 30–45 minutes so the flavors meld and the sauce naturally thickens (do not boil vigorously).
- Strain: Turn off the heat and strain through a fine sieve, discarding solids, to obtain a smooth sauce.
- Finish: Transfer the sauce to a clean pot, adjust seasoning, then gradually add Chinese black vinegar, stirring evenly.
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Assemble the Vol-au-Vent: Use a small spoon to fill the preheated vol-au-vent shells with the mixed filling.
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Plate the Vegetables: Arrange the garlic stir-fried bok choy on the plate.
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Slice the Duck: Cut the duck breast into 0.7 cm thick slices and place 4–5 pieces leaning against the vegetables.
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Add the Vol-au-Vent: Position the filled vol-au-vent alongside the duck and vegetables.
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Finish with Sauce: Drizzle the Dạ Nguyệt sauce around the plate, complete the presentation, and serve immediately.