Scotch bonnet peppers impart more flavor than heat to Pickled Onions.
Place onions in a large bowl, and sprinkle with 3 tablespoons sugar. Set aside.
Combine vinegar, salt, and remaining sugar in a saucepan over medium heat. Cook, stirring frequently, until sugar dissolves. Add pepper; cook 2 minutes. Remove pepper.
Bring mixture to a boil; stir in reserved onions. Remove pan from heat, and let stand 20 minutes. Cover and chill until ready to serve.
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