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Place a foil-lined baking sheet on top rack (2 baking sheets, on top and middle racks, for 4 servings) and preheat oven to 450 degrees. Wash and dry all produce. Finely chop tomato. Core, deseed, and dice poblano into ¼-inch pieces. Finely chop cilantro. Slice jalapeño into thin rounds, removing ribs and seeds for less heat.