In a large bowl, add sliced cabbage, salt, and green onions. Mix together.
Add in the leftover pheasant and leftover sauce. Combine.
Fill gyoza wrappers with the mixture (about 2 tsp).
Wet the edges, fold like a taco, pinch in the center, and pleat each side starting with the center. 3 total pleats. Repeat until all the filling is used.
Heat a nonstick skillet over medium heat, add just enough oil to coat the bottom pan (about 2 Tbsp).
Once hot, arrange the gyozas around the pan making sure they don’t touch. Let them cook and brown for 2 minutes.
Add water, immediately cover with a lid and let steam for 3 minutes.
Remove lid and if any liquid remains let simmer until completely gone.
Repeat until all dumplings are cooked.
Let rest for 1 minute and plate.
Cover with chili oil and serve with gyoza sauce.