Beef and Broccoli Stir Fry

Bahan-bahan (6 porsi)

• 1½ pounds flank, skirt, or sirloin steak
• 2 teaspoons cornstarch
• ¼ cup low-sodium soy sauce
• 2 tablespoons coconut or olive oil
• 1½ pounds fresh broccoli (cut into bite size pieces)
• ⅓ cup water
• ¼ cup oyster sauce
• 1 tablespoon rice wine vinegar
• 1 tablespoon balsamic vinegar
• 6 large garlic cloves (about 2 tablespoons minced)
• 1 inch fresh ginger (about 1 tablespoon minced)
• Optional: 1 tablespoon brown sugar