Chilled Lettuce Soup

Ingredients

• 2 tbsp. Olive oil
• 1 Onions
• 1 clove Garlic
• 1 tbsp. Parsley
• 1 tbsp. Chives
• 2 tbsp. Tarragon
• 2 heads Romaine lettuce
• 3 cups Chicken stock
• 1/2 cup Crème fraiche
• as needed Salt and Pepper