"We cut this familiar cold soup down to size...."
INGREDIENTS
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1 pound yellow-fleshed potatoes, such as yukon gold, cut into 1/2-inch pieces
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5 leeks, white parts only, chopped
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1/2 pound zucchini, sliced
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Salt
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1/2cup 2 percent greek-style yogurt
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2 tablespoons chopped chives