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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 450 degrees. Wash and dry produce.
Halve, core, and thinly slice green pepper crosswise into strips. Halve and peel onion; thinly slice one half. Finely chop remaining half until you have 2 TBSP. (For 4 servings, thinly slice both onion halves; finely chop a few slices until you have 3 TBSP.) Dice tomato. Zest and quarter lime.