Potatoes can be cooked, mashed, scooped and chilled up to two days in advance. Simply remove from refrigerator and place on pre-soaked planks when ready to grill. Makes 12 1/4 cup scoops.
To roast garlic, preheat oven to 350℉. Cut the top off the head of garlic and place on a double layer sheet of foil. Drizzle with oil and fold foil over bulb, crimping all edges to seal packet. Place on a baking tray and bake for about 45 minutes until golden and soft. Alternatively, you can make roasted garlic on the grill, here's how Grill Roasted Garlic