Orange-sauced Chicken Stir-fry

• 350 gr broccoli flowerets
• 240 ml unsweetened orange juice
• 200 gr chicken breast breast
• 160 gr brown rice
• 60 gr onion
• 16 ml dry sherry
• 14 gr tamari
• 16 ml cooking oil
• 8 gr cornstarch
• 1 gr ginger (ground)