Clean, peel and cut kohlrabi and carrots into thick sticks. Clean and wash the cauliflower and cut it into small florets. Heat the fat. Steam kohlrabi, carrots and cauliflower for about 5 minutes while turning.
Season with salt, pepper and dried savory. Deglaze with the stock and 1/2 litre water. Cover and cook for about 15 minutes. In the meantime, clean and wash the mangetouts. Clean, wash and chop the spring onions.
Add both to the stew and simmer for another 10 minutes. Wash the chervil, dab dry and pluck the leaves from the stems. Season stew again and serve sprinkled with chervil leaves.