Tender Beef, Mushroom and Ginger stir-fry

Ingredients

• ¼ cup light soy sauce
• 2 tbsp rice wine vinegar
• 1 tbsp white sugar
• 2 tsp sesame oil
• 4 tsp corn starch
• 250g well trimmed beef steak (sirloin tip or top sirloin)
• 1 cup whole grain brown rice
• 5-6 baby bok choy (about 14 oz)
• 1 tbsp vegetable oil
• 1 inch root of ginger, in fine strips (julienne)
• 3 large cloves garlic, minced
• ¼ tsp hot red pepper flakes (optional)
• 2 medium carrots, thinly sliced
• 2 medium onions, sliced
• 200g Swiss Brown Button mushrooms, sliced
• ½ cup chicken stock
• ½ cup blanched, halved, unsalted peanuts
• ¼ cup chopped coriander
• ¼ cup green onions, chopped