Peel and chop the sweet potato, then cook in lightly salted water until tender, about 10-12 minutes. Drain and mash with a fork until smooth. The smoother the mash, the easier it will be to fill the gyoza.
Finely chop the cabbage, lightly salt it, and let it stand for 10 minutes. Then, squeeze out any excess water with your hands to prevent the filling from becoming soggy.
Slice the green onions, and grate the garlic and ginger. In a bowl, combine the sweet potato mash, cabbage, green onions, ginger, garlic, soy sauce, sesame oil, a pinch of salt, and pepper. Mix well to ensure the spices are evenly distributed.
Place a teaspoon of filling in the center of each gyoza wrapper. Moisten one edge of the wrapper with water, fold in half, and pinch the edges together with your finger. A well-made gyoza is tightly sealed and shapely.
Heat a tablespoon of oil in a skillet over medium heat. Place the gyozas in the skillet, flat side down, and cook for 2-3 minutes until the bottoms are golden brown.
Pour 100 ml of water into the skillet, immediately cover, and steam for 5-6 minutes, until the water evaporates. This combined frying and steaming technique gives the gyoza its characteristic texture: a crispy bottom and a soft top.
Once the water has completely evaporated, remove the lid and cook for another 1-2 minutes to crisp up the bottom of the gyoza again.
Serve hot, with soy sauce for dipping. Tip: You can sprinkle with fresh chopped green onions or toasted sesame seeds before serving.
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