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2 tablespoons butter or margarine
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1 small head Boston lettuce, shredded
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1 medium-size onion, chopped
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2 teaspoons parsley, finely chopped
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2 stalks celery, with leaves, chopped
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2 teaspoons dried mint
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2 (10-ounce) packages frozen peas
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1 cup plain yogurt
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salt
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freshly ground pepper
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1 tablespoon fresh mint, chopped
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