Preheat the grill, setting the burners to medium. Place the potatoes, onion and butter on a sheet of lightly oiled aluminum foil. Season with salt and pepper. Close to seal. Bake on the grill for about 30 minutes or until the potatoes are tender.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.