Bring a small pot of salted water to a boil. Add the chives and cook until bright green and tender, about 3 minutes. Drain and rinse under cold water until cooled. Gently squeeze the water out of the chives. Put the chives, sour cream, horseradish, 1 1/4 teaspoons salt and 1/4 teaspoon pepper in a blender and blend until smooth.
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