1/4 cup reduced-fat sour cream
1/3 cup fat-free or reduced-fat plain yogurt
1 1/2 tablespoons tarragon or white wine vinegar
1 1/2 teaspoons sugar
1/2 teaspoon salt
1/8 teaspoon freshly-ground black pepper
3 large cucumbers
1 medium Vidalia or other sweet onion
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