Wash, clean and finely dice the zucchini and cucumbers. Clean and wash spring onion and cut into fine rings. Peel garlic and press it through a garlic press. Wash and chop the herbs. Heat oil. Fry zucchini, 1 cucumber, spring onion and garlic briefly.
Add the stock, bring to the boil briefly and let it cool down. Puree remaining cucumber cubes and herbs. Mix with buttermilk and add to the vegetables. Season to taste with salt and pepper. Garnish as desired with chives, dill and nasturtium flowers