Instructions: Heat a wok over high heat until hot. Pour in the vegetable oil. Add the fried shallots and cook until the oil begins to smoke, about 1 minute. (If using fresh shallots, you may need to cook them for about 30 seconds to 1 minute longer, until golden brown.) Drain the shallots and reserve the oil.

Return the wok to high heat, add the shallot-flavored oil, sugar, onion, soy sauce, oyster-flavored sauce, sesame oil and dark soy sauce. Cook until onion is soft, about 2 minutes. Stir the stock and flour together in a small bowl until smooth. Pour the flour mixture into the wok, reduce the heat to low and cook, stirring, until the flour is dissolved and the mixture is thickened.

Remove the wok from the heat and stir in the Char Siu. Scoop the filling out of the wok and refrigerate until chilled.

This recipe yields enough filling for 15 buns.

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