INGREDIENTS
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4 tablespoons plain low-fat yogurt
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2 tablespoons light sour cream
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1 teaspoon tarragon or white wine vinegar
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1 tablespoon chopped fresh tarragon
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1 tablespoon chopped fresh dill
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2 chopped scallions, green part only
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1/2 teaspoon anchovy paste
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5 cups torn butter lettuce (1 head)
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3 cups torn escarole (1 head)