Place the sweet potato in a bowl with 1 tbsp of olive oil. Mix together
Lay the sweet potato in one layer on a baking tray and add to the oven. Bake until soft, approx. for 25 minutes. Turn half way through cooking
Add the remaining oil to a frying pan over a high heat. Place the steak in the frying pan and cook for 3 minutes each side for medium-rare, or 4 minutes each side for medium
Add the apple and peppers to the frying pan for the last 2 minutes of cooking. Make sure you keep an eye on the apple as it can stick to the pan. Stir the mixture every so often
Sprinkle the chilli flakes into the pan for the last 30 seconds
Serve the sweet potatoes with the steak, apple and pepper.
Squeeze over juice from the lemon to your liking and serve