In a bowl, whisk together the egg yolks, sugar, and cornstarch. Gradually add the milk, mixing until smooth and ensuring no lumps remain.
Pour the mixture into a saucepan, add the grated ginger, lemon zest, and lemon juice. Cook over low heat, stirring constantly, until the mixture thickens. TIP: For a smoother texture, strain the finished cream.
Once the cream is ready, remove from the heat and let it cool to room temperature. Meanwhile, steam the bao buns: place them in a steamer lined with parchment paper and steam for 5-6 minutes over boiling water.
Gently open the warm bao buns and spoon a generous amount of the ginger-lemon cream into each. Be careful not to overfill them, as this may cause the dough to become soggy.
Serve immediately, or let them cool for a few minutes to allow the filling to set slightly. Tip: these are also excellent served cold with a refreshing drink.
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