1. Place the vegetables in a large soup pot with the garlic, olive oil, salt and pepper and stir to coat them. Cook gently over medium heat until they begin to soften but don’t brown. Stir in ½ cup of the hazelnuts and add the broth. Simmer the soup until the vegetables are completely soft and tender, about 20 minutes. Allow the soup to cool.
2. In a blender or food processor, blend the soup with the honey and milk. Taste and adjust the seasoning.
3. Reheat gently and ladle the soup into bowls. Garnish each bowl with some minced chives or scallions, a teaspoon of brown butter, a sprinkle of sumac and some slightly crushed hazelnuts.