Step 1

Fit a large saucepan or pot with a steamer basket, and fill with water up to the bottom of the steamer.Bring to a boil, add potatoes and cook until just tender, about 15 minutes.Make sure that the water doesn’t boil away. Spread the potatoes out over a baking sheet to cool slightly.

Step 2

Meanwhile, stir together parsley, yogurt, mayonnaise, onion, horseradish, salt and pepper in a large bowl.

Step 3

Stir in the potatoes and eggs. Chill completely before serving, about 4 hours or overnight.