Remove the outer leaves from the cabbage, halve and quarter the cabbage, cut out the stalk and cut or slice the cabbage into fine strips. Dice bacon finely. Peel and finely dice onions. Crush caraway roughly.
Heat the oil in a wide saucepan, fry the bacon and onions for approx. 3 minutes, turning them over until colourless. Pour in vinegar, bring to the boil and remove from heat. Add cabbage and caraway and mix well. Pour into a bowl, let cool down briefly and knead again with your hands. Season to taste with salt, pepper and sugar. Let the cabbage salad cool down and put it in a covered place overnight.
Clean and wash spring onions and cut into fine rings. Season salad again with salt and sugar, arrange in a bowl with spring onions.