Chilled Curried Pumpkin Soup

• 1 onion (white sliced)
• 1 bay leaf
• 1 few springs parsley
• 1 whipping cream salt
• 1/2 stick
• 950 ml chicken stock
• 475 ml milk
• 90 gr green onion only (sliced white)
• 55 gr butter
• 2 gr sugar