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4 large eggs, hard-boiled and peeled
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2 to 3 green onions, minced
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2 ribs celery, plus some leaves, chopped
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1/3 cup mayonnaise
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1 tablespoon Dijon mustard
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salt
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freshly ground pepper
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8 slices whole wheat bread
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mayonnaise
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1 head Boston lettuce
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2 large tomatoes, thinly sliced
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