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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.
Dice sweet potatoes into 1⁄2-inch pieces. Trim and cut scallions into 1-inch pieces. Zest and quarter lime (for 4, zest one lime and quarter both). Dice tomato into 1⁄4-inch pieces.
Toss sweet potatoes on one side of a baking sheet with a drizzle of oil, salt, and pepper (for 4, spread sweet potatoes out across entire sheet). Roast on top rack for 10 minutes (you’ll add more to the sheet then).