Green Asparagus Soup with Celery Seed Sour Cream and Toasted Hazelnuts

Name: Green Asparagus Soup with Celery Seed Sour Cream and Toasted Hazelnuts
Ingredients: 2 Pounds fresh asparagus, trimmed of woody ends; 3 spring onions, trimmed; 1 Cup fresh mint leaves; 2 Cups vegetable broth; 1 Cup heavy cream (optional); 1/2 Teaspoon fine sea salt; 1/4 Teaspoon freshly ground white pepper; 1 Cup sour cream; 1 Teaspoon celery seed, lightly toasted; Sea salt and freshly ground black pepper, to taste; 1 1/2 Teaspoon lightly toasted hazelnuts, papery husks removed and coarsely chopped; 2 Teaspoons chopped fresh chives