For the vegetables, wash and clean the beans and cook in boiling salted water for about 10 minutes. Wash and clean the zucchini, cut them in half lengthwise and slice them diagonally. Peel onions and cut into fine slices.
Peel garlic and chop finely.
For the risotto, dissolve vegetable stock in 800 ml of boiling water. Heat 1 tablespoon of oil in a saucepan. Fry about half each of the onions and garlic cloves until transparent. Add rice. Roast for 2-4 minutes until it crackles slightly.
Pour the wine, bring to the boil. Simmer on low heat until the liquid is absorbed. Add so much of the hot broth that the rice is covered. Simmer open for about 30 minutes, adding a little stock every now and then.
Stir in horseradish and parmesan. Season to taste with salt and pepper. Keep warm and decorate with horseradish chips if necessary.