In a bowl, combine the flour, baking powder and sugar. Make a well in centre. Add the shortening, egg white and vinegar. Gradually add the warm milk and blend until a ball forms. Knead for 2 to 3 minutes. Cover and let stand for 15 minutes at room temperature.
Divide the dough into 18 small balls. Flour a work surface and roll out the balls into 5-cm (2-inch) in diameter discs.
Place about 10 ml (2 teaspoons) of lotus paste in the centre of each disc of dough, fold and shape back into balls. Place on a square of parchment paper and steam for about 10 minutes.
Count about a dozen dim sum per person. You can prepare more, they freeze beautifully.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.