Morrocan Carrot Soup

Ingredients

• 2 tablespoons (1/4 stick) butter
• 1 cup chopped onion
• 1 pound large carrots (, peeled, cut into 1/2-inch dice (about 2 2/3 cups))
• 2 1/2 cups chicken or vegetable broth
• 1 1/2 teaspoons cumin seeds
• 1 tablespoon honey
• 1 teaspoon fresh lemon juice
• 1/8 teaspoon ground allspice
• 1/2 cup plain yogurt (, stirred to loosen)