In a food processor, combine all the ingredients, and pulse about 10 times until everything is ground together.
Lay the dumpling wrappers out on a parchment lined, cornstarch dusted, baking sheet. Put one teaspoon of filling in the middle of each wrapper, and then moisten the edges with water. Raise one side of the dumpling straight up and pinch into a pleat. Repeat on all sides of the dumpling.
Fill a Dutch oven with and inch of water, and bring it to a boil. Line your steamer with lettuce leaves and place the shumai on top of the leaves. Steam for 12 minutes. Serve with dipping sauce.