Chicken with Long Beans and Walnuts

Ingredients

• 1 12-ounce skinless, boneless chicken breast halves
• 2 tablespoons hoisin sauce
• 1 tablespoon soy sauce
• 1 tablespoon water
• 1/2 teaspoon sugar
• 8 ounces fresh Chinese long beans*, cut into 4-inch lengths, or 8 ounces fresh whole green beans
• 1 tablespoon cooking oil
• 3 cloves garlic, minced
• 1 medium onion, cut into thin wedges
• 1/2 cup coarsely broken walnuts
• 2 cups hot cooked rice