Boil up approx. 1 1/2 l water with bay leaf, stock and possibly peppercorns in a large pot. Wash the chicken breasts thoroughly and cook in the broth for about 20 minutes
In the meantime peel and wash the vegetables. Cut carrots into slices, kohlrabi into coarse sticks. Add both to the stock after 6-8 minutes cooking time. Add peas after 15 minutes
Take out the chicken breasts. Remove flesh from skin and bones. Cut into bite-sized pieces and put back into the broth. Wash, pluck and chop the herbs
Season the soup with salt, pepper and Worcestershire sauce and divide it between 4 plates. Add 1/2 tablespoon crème fraîche to each plate and sprinkle with herbs