1
Adjust rack to top position and preheat oven to 450 degrees. Wash and dry produce.
Slice potatoes into 1⁄4-inch-thick rounds (no need to peel). Peel and thinly slice garlic. Trim green beans if necessary. Trim and remove strings from snap peas. Trim scallions, then cut crosswise into 1⁄2-inch pieces. Zest and quarter lemon.