Prepare the Filling: In a large bowl, add the tofu and use a fork to mash it into a rough crumble.
Add the minced scallion, chopped leek (or cabbage/bok choy), ginger, rice wine, sugar, soy sauce, sesame oil, and the lightly beaten egg.
Sprinkle with a generous pinch of salt and pepper.
Mix gently until everything is just combined.
Assemble the Dumplings: Place about 2 teaspoons (10 ml / 0.3 fl oz) of the tofu filling in the center of one dumpling wrapper. Moisten the outer edge of the wrapper with a dab of water using your fingertip.
Fold the wrapper in half to create a semicircle, pressing the edges firmly to seal. Ensure no air is trapped inside.
Place the finished dumpling on a lightly floured plate or a sheet of wax paper and repeat with the remaining wrappers and filling.
Steam the Dumplings: Set up your steamer over 1-2 inches of boiling water. Lightly oil the steamer basket to prevent sticking.
Arrange the dumplings in a single layer, ensuring they do not touch each other.
Work in batches if necessary.
Cover and steam for about 10 minutes, or until the wrappers are translucent and the filling is cooked through.
Serve immediately with your favorite dipping sauce on the side.
Don't overstuff the wrappers.
Using about 2 teaspoons (10 ml / 0.3 fl oz) of filling is the perfect amount to ensure the dumplings seal tightly and won't burst open during steaming.