Sticky Pork Stir Fry

• 1 tbsp extra virgin olive oil
• 400 g pork fillets, thinly sliced
• 1 large brown onion, cut into thin wedges
• 2 cm piece fresh ginger, peeled and grated
• 1 carrot, halved, cut diagonally
• 1 red capsicum (pepper), thinly sliced
• 1 bunch pak choy, end removed
• 3 tbsp oyster sauce
• 1 tbsp maple syrup
• 250 g brown rice, cooked