Preheat and grease grill. Boil potatoes in water for 6 minutes, until slightly cooked but raw in center. Strain potatoes in a colander. Place potato slices on grill. Using a pastry brush, apply butter and sprinkle each slice with House Seasoning. Grill potato slices for 4 to 5 minutes and flip slices, repeating with butter and House Seasoning. Cook untli grilled through. House Seasoning: Combine salt, pepper and garlic powder in a small bowl.