In the bowl of a food processor, pulse the cabbage several times until it’s finely chopped.
Place the cabbage in a bowl and sprinkle with salt. Let it set for about 10 minutes to remove excess moisture. Squeeze cabbage, or wring in a clean towel.
In the same bowl of the food processor, pulse pork, shrimp, soy sauce, sesame oil, avocado oil, rice wine OR sherry, hoisin, ginger, pepper and 1/2 teaspoon salt and pulse until dumpling filling is mixed slightly sticky, about 10 pulses.
Add chopped napa cabbage and green onions and pulse until veggies are mixed, about 8 to 10 pulses. Cover with plastic wrap and refrigerate until ready to use.
Prepare 2 baking sheets with parchment paper. Cover wrappers with slightly damp cloth to keep them from drying out.