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Adjust rack to top position (top and middle positions for 4 servings) and preheat the oven to 450 degrees. Wash and dry produce.
Dice tomato into ¼-inch pieces. Trim and thinly slice scallions, separating whites from greens. Zest and quarter lime. Mince jalapeño, removing ribs and seeds for less heat.
Open and drain tofu; press out excess water with paper towels. In a large bowl, crumble tofu into small pieces (similar to the texture of ground meat).