Spoon up to 1 tablespoon of filling into each dumpling wrapper. Use your fingers to dab a bit of water around the edges of each wrapper. Fold the wrappers in half, over the filling, and pinch the edges shut.
Prepare your bamboo steamer by placing banana leaves, napa cabbage leaves or parchment paper on the bottom to prevent the dumplings from sticking. Place dumplings in the steamer with enough space between them so that they are not touching.
Steam dumplings in bamboo steamer over simmering water for 10 to 12 minutes. You can also steam them in a large skillet with 1/4 to 1/2 inch water at the bottom.
Serve with ponzu dipping sauce.