In a large bowl, mix the ground meat, cabbage, carrot, garlic, ginger, scallions, sesame oil, soy sauce, and pepper flakes until well combined.
Set a small bowl of warm water by your work area. Working one at a time, scoop a heaping tablespoon of the filling onto a wonton wrapper. Dip your fingertip into the water and dab a little on each corner of the wrapper. Bring together two opposite corners and press to seal, repeat with the other two corners. (Don't worry about sealing all the seams.) Repeat this process until the filling is gone.
Meanwhile, heat some water in a large pot fitted with a steamer. (Bamboo steamers work best, but a metal or silicone one works, too. If using metal, spray with non-stick cooking spray before using.) When ready to cook the dumplings, bring the water to a rolling boil and place some of the dumplings in the steamer, making sure they aren't touching one another. Steam until the meat is cooked through, 6-8 minutes. Repeat until all the dumplings are cooked.
Serve immediately with a bowl of soy sauce (with a splash of sesame oil) for dipping.
Recipe by Three Many Cooks at https://threemanycooks.com/recipes/nibbles-and-apps/homemade-dumplings/