Preheat oven to 200°C. Wash and dry potatoes. Leaving the skin on, cut into 2cm chunks. Put into a bowl with the red onion wedges. Toss olive oil through the vegetables. Place on an oven tray lined with baking paper in a single layer. Roast for 20 minutes. Remove from the oven. Scatter over chorizo sausage. Return tray to the oven and continue roasting for a further 15-20 minutes, until the potatoes are cooked and golden. Remove from the oven and set aside to cool.*
Place the cold vegetables and chorizo into a bowl. Add red capsicum and parsley. Mix through HEINZ [SERIOUSLY] GOOD™ Mayonnaise.
* Ensure the potatoes are cold before mixing in the mayonnaise.