¼ cup dried shiitake mushrooms, rehydrated and minced
2 tablespoons soy sauce
1 tablespoon oyster sauce
1 tablespoon Shaoxing cooking wine
½ tablespoon sesame oil
½ tablespoon kosher salt
¾ teaspoon sugar
½ teaspoon freshly ground white pepper
2 small scallions, trimmed and minced
One 1-inch piece ginger, peeled and minced
18 round dumpling wrappers
Soy sauce, for serving
Chinese hot mustard, for serving
Directions
Make the filling: In a large bowl, combine all the filling ingredients and mix until incorporated.
Assemble the shumai: For each shumai, spoon 2 tablespoons of the filling into the center of a dumpling wrapper. Using a butter knife, press the edge of the wrapper in toward the center. Continue this around the circumference of the wrapper, indenting every ¼ inch.
In a steamer (preferably bamboo) set over a pot of simmering water, steam the dumplings in batches, covered, until cooked through, 10 minutes. Transfer to a platter and serve with soy sauce and Chinese hot mustard on the side.