Ingredients

• 10 oz pearl onions
• 1/2 tablespoon olive oil
• 2 tablespoons tomato paste dissolved in 2 cups water
• 1/3 cup golden raisins
• 1/3 cup red-wine vinegar
• 1/4 cup sugar
• 1 (2-inch-long) fresh rosemary sprig
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• Accompaniment: crostini

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Instructions

1. Blanch onions in boiling water 3 minutes, then drain in a colander and rinse under cold water. Peel onions.
2. Heat oil in a 10-inch heavy skillet over moderate heat until hot but not smoking, then cook onions, shaking skillet frequently, until browned, about 4 minutes. Add remaining ingredients, stirring until sugar is dissolved, then simmer, uncovered, stirring occasionally, until onions are tender when pierced with a fork and most of liquid is evaporated, 40 to 45 minutes. Cool onions completely and discard rosemary sprig.