Sort the kale, wash thoroughly. Blanch in boiling salted water in portions for 2-3 minutes. Drain, chop coarsely
Soup greens and potatoes clean or peel, wash and cut into pieces. Cut bacon into thick slices
Fry the slices of bacon in a pan without fat until crispy and remove. Fry the soup greens and potatoes briefly in the bacon fat. Add kale and bacon, add 1 1/2 l water. Bring to the boil and stir in the stock. Cover and simmer for about 1 hour. Season to taste with salt, pepper and mustard