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Adjust rack to top position and preheat oven to 450 degrees. Arrange bacon* 1-2 inches apart on a baking sheet. Roast on top rack until crispy, 10-12 minutes.
Once bacon is crispy, transfer to a paper-towel-lined plate. Once cool enough to handle, roughly chop.
Wash and dry produce. Trim and thinly slice scallions, separating whites from greens. Halve, peel, and finely dice onion. Dice tomatoes into ½-inch pieces.