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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce.
Cut potatoes into ΒΌ-inch-thick rounds. Peel and mince or grate garlic. Cut broccoli florets into bite-size pieces if necessary. Halve, peel, and mince shallot. Pick and finely chop fronds from dill. Zest and quarter lemon.