Orange-Flavored Chicken with Sweet Pepper & Asparagus

Ingredients

• 1 orange
• 2 tablespoons rice wine or dry sherry
• 1 tablespoon soy sauce
• 1 teaspoon sugar
• 1 1/4 teaspoons cornstarch
• 1/4 teaspoon red pepper flakes
• 1/2 pound asparagus, trimmed and cut into 5 cm pieces
• 1 tablespoon vegetable oil
• 1 pound boneless, skinless chicken breasts, cut into 1.25 cm strips
• 1 tablespoon finely chopped, peeled fresh ginger
• 1 clove garlic, minced
• 1 red bell pepper, seeded and cut into strips
• 4 scallions, cut into 5 cm pieces
• 1/3 cup walnuts, chopped