Preheat the oven to 200°C. Cut the onions into wedges. Place all the vegetables, except the asparagus, in a large baking tray with olive oil, sea salt and freshly ground pepper.
To make the coating, combine the flour, oregano and paprika in a shallow bowl and season with salt and pepper. Coat the Sadia Chicken Drumsticks with the flour mixture and place on top of the vegetables. Scatter the remaining flour/herb mix over the vegetables. Drizzle the chicken with the olive oil and lemon juice.
Roast the chicken for 40-50 minutes, until cooked. Turn the vegetables twice and baste the chicken with the pan juices. Add the olives and asparagus 15 minutes before removing the pan from the oven. Transfer to a warm platter to serve with a green salad.