Curried Pumpkin Soup

• 1 onion (chopped)
• 1 bay leaf
• 3/4 scallions (sliced)
• 1/2 high
• 1,400 gr pumpkin preheat the oven
• 1,000 gr pumpkin puree
• 950 ml chicken broth
• 240 ml sour cream (optional)
• 55 gr butter
• 18 gr chives (finely chopped)