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Place a lightly oiled baking sheet on top rack (for 4 servings, 2 lightly oiled baking sheets, on top and middle racks) and preheat oven to 450 degrees. Wash and dry produce.
Trim and halve zucchini lengthwise; thinly slice crosswise into half-moons. Halve tomatoes. Peel and mince or grate garlic. Zest and quarter lemon.
Heat a drizzle of oil in a large pan over medium-high heat. Add bacon and cook, turning occasionally and adjusting heat if browning too quickly, until crispy, 6-10 minutes. Turn off heat; transfer to a paper-towel-lined plate. Wipe out pan. Once cool enough to handle, roughly chop.