1
Adjust rack to top position and preheat oven to 450 degrees. Wash and dry produce.
Slice sweet potato into 1⁄4-inch-thick rounds. Quarter lemon. Halve buns. Slice half the tomato into 1⁄4-inch- thick rounds; dice remaining tomato into 1⁄4-inch pieces. Transfer diced tomato to a large bowl; season with salt and pepper.