Curried Courgette Soup

This used up the last of my courgettes. I love making courgette, this one is spicy and fresh. 

Curried Courgette Soup (from Health Magazine)
(Serves 4)

2 tablespoons olive oil
1 onion, chopped
1 clove garlic, minced
2 tsp curry powder
900g courgette, coarsely chopped
1l chicken or veg stock
salt and pepper
4 tbsp sour cream
2 tbsp chopped fresh coriander for garnish

Warm oil in a pot over medium heat. Add onion and sauté until softened, 6 to 8 minutes. Add garlic and curry powder and stir until fragrant, about 1 minute. Raise heat to medium-high, add zucchini, pour in broth and add 1 tsp. salt. Cover and bring to a simmer. Remove cover, reduce heat to medium to maintain a simmer and cook until zucchini is very tender, about 20 minutes. Remove from heat and let soup cool slightly. 2. Working in batches, puree soup in a blender until smooth whisk in sour cream and season with salt and pepper. Ladle into chilled bowls, garnish with cilantro and serve.