Curried celery soup (vegan, gluten free)

Ingredients

• 2 teaspoon olive oil
• 1 onion, chopped
• 1 leek, washed and sliced
• 1 1/2 pounds celery, chopped
• 1 tablespoon curry powder
• 2 potatoes, washed, peeled and diced
• 3 3/4 cups vegetable stock
• 1 bouquet garni (parsley, thyme and bay leaf tied together)
• 2 tablespoons fresh parsley, finely chopped