Leek and Avocado Soup

Ingredients

• 1 tbsp extra-virgin olive oil
• 1 lb leeks halved lengthwise and sliced
• 1 garlic clove, minced
• 2-1/2 cups vegetable or chicken stock
• 1 large, ripe avocado, halved and pitted
• 1/2 cup low-fat plain yogurt
• 1 tbsp lime juice
• 2 tbsp chopped fresh cilantro
• Salt and black pepper
• Lime slices
• Cilantro sprigs