Wash the cucumber. 3⁄4 Chop the cucumber coarsely, 1⁄4 finely. Peel garlic and chop finely. Clean and wash spring onions and cut into rings. Heat 1 tablespoon of oil in a pot. Fry the cucumber, garlic, the white and light green of the spring onions. Deglaze with white wine and 1⁄4 l water. Stir in stock, bring to the boil and simmer for about 2 minutes. Let the cucumber mix cool down a little, then put it in a cool place.
Cut the avocado in half, remove the seeds and peel the flesh. Finely puree the cold cucumber mix, avocado and yoghurt. Season with salt and pepper.
Wash the dill, shake dry and chop the flags finely. Add the remaining cucumber, spring onion green and dill to the soup. Serve the soup. Sprinkle with 3 tablespoons of oil and sprinkle with chili flakes as desired. Ciabatta tastes good with it.