Preheat the barbecue, with the hotplate in, for direct cooking.
Once the barbecue is preheated, turn all the burners to medium. Lightly coat the hotplate with the olive oil.
Lay the potatoes evenly over half of the hotplate. Add the onions to the hotplate and season with salt and pepper.
Once the onions and potatoes are cooking, place the sausages and lamb chops directly on the grill.
Close the lid and cook for 4 to 6 minutes, stirring the onions occasionally. Open the lid and turn the potatoes, sausages, and lamb chops. Close the lid and cook for a further 4 to 6 minutes, stirring the onions occasionally.
Remove from the grill and season the lamb chops and potatoes with salt and pepper to taste.