INGREDIENTS
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2 tablespoons cider vinegar
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1 tablespoon finely chopped shallot
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1/2 teaspoon coarse-grain mustard
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3/8 teaspoon sugar
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1/4 teaspoon salt
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1/4 teaspoon black pepper
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1/3 cup olive oil
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3/4 lb Bibb lettuce (3 medium heads), larger leaves torn into bite-size pieces
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1/4 cup loosely packed small fresh tarragon leaves