An easy but delicious vegetarian soup with an herby yogurt sauce.
In a blender, combine yogurt, cilantro and basil; blend until cilantro and basil are finely chopped. Cover and place in the refrigerator to chill.
In a large saucepan, heat oil over medium heat. Add scallion, onion, bell pepper and garlic; sauté for 10 minutes or until onion is translucent. Add curry powder; continue to stir. Slowly add vegetable broth and tomatoes; bring to a boil. Add black beans, chili powder and apple cider vinegar. Cover, reduce heat and simmer for 25-30 minutes.