Hydrate mushrooms into water for 30 minutes or until they are fully hydrated. Weigh them down so they are all submerged. One hydrated, squeeze them out, remove the stems, finely dice them and squeeze. Make sure all water is removed.
Remove the Beyond Sausage from he casing if yo can by not imperative. Combine the Beyond, shiitakes, cilantro, garlic, green onion, light soy sauce, rice vinegar, salt, and white pepper in a large bowl. Stir with a spatula until the ingredients are well combined and form a sticky paste. Thorough mixing is essential here, so your dumpling filling will stay together when you wrap dumplings. Cover with a plastic wrapper and allow to marinate in fridge until you’re ready to wrap the dumplings.
Cut 6 - 8 pieces Napa cabbage leaves (just enough to line the steamer) and keep for later. Cut the rest of the cabbage into small cubes and set aside. If you don’t have extra extra cabbage leaves, then you can use parchment paper.
Cut the cabbage into fine shreds. Then sprinkle 2 pinches of salt onto the cabbage and mix well with your hands. Allow this to sit for 10 - 15 minutes. Use a few layers of cheesecloth or paper towel to squeeze out extra water. Again, be diligent in removing the excess liquid or your dumplings will be soggy.
Just before wrapping dumplings, add the Napa cabbage, green onion, and sesame oil into the “meat” mixture. Stir to mix well.