Three-onion Asparagus Soup Recipe - Vegetarian Food

Ingredients

• 2 tbsp butter
• 1 large leek , white part only, well washed and chopped
• 4 scallions , trimmed and chopped
• 0.5 lb (227 g) potatoes (1 large), peeled and cubed
• 1 lb (454 g) asparagus , trimmed and chopped
• 4 cups vegetable stock
• salt to taste
• about 1 tbsp lemon juice
• 0.33 cup crème fraîche , sour cream or plain yogurt
• 12 to 16 chives , sliced
• 4 radishes , thinly sliced