Yogurt-Orange Chicken

Ingredients

• 1 (3 to 3 1/2 lb.) frying chicken, cut into pieces
• salt and pepper
• 2 Tbsp. butter or margarine
• 1 large onion, chopped
• 2 cloves garlic, minced or pressed
• 2 large oranges
• 1/2 tsp. each: ground coriander, ground cumin and salt
• 1 Tbsp. sugar
• 1 Tbsp. cornstarch, mixed with 1 c. unflavored yogurt