Step 1

Place potatoes in a large saucepan and cover with cold salted water by 1 inch. Bring to a boil and simmer until just tender, about 15 minutes; drain well and let cool.

Step 2

In a large bowl, whisk together mayonnaise, sour cream, Dijon, lemon juice and lemon zest; season with salt and pepper, to taste. Stir in celery, capers, parsley, dill, green onions and potatoes until well combined. Cover and chill for at least 4 hours to 2 days.

Step 3

Serve, topped with eggs.