Yield: 40 dumplings
For the Dumplings
For the Dipping Sauce
Put chopped scallops and shrimp in a bowl. Add salt, pepper, ginger, scallions, sesame oil, chopped cilantro and serrano chile. Mix well with a wooden spoon, then cover and refrigerate at least 1 hour. (Mixture may be prepared up to 1 day ahead.) You should have about 2½ cups filling.
Working in batches, line up dumpling wrappers on a work surface. Place 2 teaspoons filling in the center of each wrapper. Lightly moisten the edge of each wrapper with water and pinch together to surround filling and form a half-moon. Pleat edges to secure the seal.
Bring a large low pot of well-salted water to boil over high heat. Meanwhile, make the dipping sauce: Whisk together rice vinegar, spicy sesame oil and slivered scallions in a small serving dish.
Add 12 dumplings at a time to the pot. When they bob to the surface, simmer 4 minutes, then remove with a slotted spoon or spider. Serve each person 3 or 4 dumplings in a small bowl. Drizzle with 1 teaspoon dipping sauce and garnish with cilantro sprigs.
