Ingredients

• 2 tablespoons olive oil
• 1 large onion, coarsly chopped
• 3 garlic cloves, minced
• 1 1/2 teaspoons ground cumin
• 1 1/2 teaspoons ground coriander
• 1/4 teaspoon cayenne pepper
• 1 (29 ounce) can pumpkin
• 1 (14 ounce) can chicken broth
• 1 tablespoon sugar
• 1 1/4 teaspoons salt
• 1/4 teaspoon black pepper
• 6 cups water
• plain yogurt
• 1 large russet potato, peeled and cut into 1 inch chunks