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Bring a medium pot of salted water to a boil. Wash and dry produce.
Halve, peel, and thinly slice onion.
Heat a large drizzle of oil in a large, preferably nonstick, pan over medium-high heat. Add onion; cook, stirring occasionally, until browned and softened, 8-10 minutes. Add 1 tsp sugar (2 tsp for 4 servings) and a splash of water; cook until caramelized, 2-3 minutes more. Season with salt and pepper. Turn off heat; transfer to a plate. Wipe out pan.