Clean and wash the zucchini, cucumber and spring onions. Finely dice the zucchini. Halve cucumber, remove seeds and dice finely. Cut spring onions into rings. Peel and chop onion
Heat the oil in a pot. Fry the onion until transparent. Add zucchini, cucumber and spring onions briefly. Deglaze with 1/4 l water, bring to the boil and stir in stock. Cover and cook for about 5 minutes. Let it cool down
Wash the herbs, shake dry and cut finely. Lift half the vegetables out of the stock. Add half of the herbs to the stock and puree everything. Stir in buttermilk, remaining vegetables and rest of herbs. Season to taste. Garnish with the flowers if necessary.