Avocado Soup

Ingredients

• 2 tbsp unsalted butter
• 1 medium yellow onion, chopped
• 2 large fresh or pickled jalapeno peppers with seeds, minced (wear gloves when handling, they burn)
• 2 tbsp all-purpose flour
• 3-1/2 cups homemade chicken stock or low-sodium canned chicken broth
• 2 medium ripe avocados, peeled, halved and pitted
• 1/2 cup low-fat plain yogurt
• ¼ cup chopped, fresh cilantro
• Fresh lemon juice to taste