To prepare the Pulse for direct cooking over medium-high heat (240°C-260°C), preheat the barbecue by turning the control knob(s) to high. Preheat until the barbecue reaches at least 260°C, which will take approximately 15 to 20 minutes with the lid closed.
Once the barbecue is preheated, open the lid and brush the cooking grills clean. Adjust the control knob(s) to one notch greater than medium for direct cooking over medium-high heat.
Lightly coat the onion and potato slices with oil and season with salt and pepper, turning gently to coat all sides. Barbecue the onions and potatoes over direct medium-high heat, with the lid closed as much as possible, until tender 10 minutes, turning once. Remove from the barbecue.
Lightly brush the lamb chops with oil, and season with salt and pepper. Barbecue the lamb chops and sausages over direct medium-high heat for 8-12 minutes, turning once, until the lamb reaches 60°C (medium) and the sausages reach 68°C (medium well).