Toss the onion, sweet potato, pepper and courgettes in an oven dish with the olive oil and roast for 20 minutes.
Add the tomatoes to the dish and stir in the balsamic vinegar and the sugar.
Return to the oven for a further 15 minutes
Add the purple sprouting to the pan and sprinkle over the feta cheese.
Return to the oven for a final 15 minutes, season with a little black pepper, plate up and enjoy.