Peel and finely dice the onions. Clean and wash the cabbage and cut it into coarse leaves. Melt the fat. Sauté one onion and cabbage in it. Season with salt and pepper. Deglaze with broth and cook covered for about 20 minutes.
Meanwhile cut the bacon and toast into cubes. Wash the thyme and pluck the leaves from the stems. Fry bacon, remaining onion and toast cubes in hot oil until crispy. Stir in the thyme leaves. Puree the soup and season to taste again.
Serve in portions garnished with fried bacon and fresh herbs.