Fry the onions and mushrooms in hot oil, add the rice and let them sweat briefly while stirring. Deglaze with a good 0.4 l of stock and allow to swell for about 20 minutes while stirring regularly. Pour in a little more broth if necessary. Fold in the soy cream and season with salt and pepper.
Cut off the kohlrabi a good 2 cm below the leaf base, peel and hollow out. Put the chopped dates and the inside of the kohlrabi under the risotto and fill the hollowed kohlrabi.
Put the kohlrabi in a suitable saucepan, pour in the rest of the broth, put on the kohlrabi lid and cook covered for about 35 minutes at a low temperature.