Clean and wash the cabbage and remove 6 outer leaves. Blanch leaves briefly in boiling salted water. Rinse under cold water, cut in half lengthwise and remove stalk. Cut the rest of the cabbage into small pieces.
Knead the cabbage well in a bowl with 1/2 tsp salt, 1 tbsp sugar and vinegar. Season with chilli and let it stand for about 2 hours.
Peel and finely chop the garlic and ginger. Knead minced meat, rice wine, soy sauce, 1 tablespoon sugar, ginger and garlic. Spread halved cabbage leaves on the work surface side by side. Form 12 balls from the minced mixture, spread them on the cabbage leaves and wrap them tightly.
Bring the stock to the boil in a pot. Cook the balls for about 10 minutes. Wash coriander, shake dry, pluck leaves from the stems and chop coarsely. Clean and wash spring onions and cut into rings.
Season cabbage salad with salt and pepper. Fold the coriander and spring onions into the cabbage. Arrange cabbage salad and balls on plates, sprinkle with chilli flakes.