Emerald Soup, with spinach and leeks, an elegant first course.

Ingredients

• 1 onion, 145gr, 5.1oz
• 2 ribs celery, 100gr, 3.5oz
• 2 leeks, 160gr, 5.6oz
• 1 medium potato, 175gr, 6.2oz
• 1 tbs butter, 14.2gr, 1oz
• 10 - 12 oz fresh spinach, 285gr, 10oz
• 3 - 4 cups chicken stock, 790gr, 28oz
• more stock if needed to get desired consistency
• 2 tbs crème fraiche or Greek Yogurt for garnish, 37.5gr, 1.3oz Yogurt