Ingredients
2
lb small yellow-fleshed potatoes such as Yukon Gold
1
small red onion, finely chopped (1/3 cup)
1/4
cup chopped fresh dill
Directions
1.
Cover potatoes with salted cold water by 1 inch and bring to a boil, then reduce heat and simmer, uncovered, until potatoes are tender, 15 to 20 minutes. Reserve 1/4 cup cooking water, then drain potatoes in a colander.
2.
While potatoes are boiling, soak onion in cold water 15 minutes, then drain in a sieve and pat dry.
3.
When potatoes are just cool enough to handle, peel and quarter, then toss with lemon juice and salt in a large bowl.
4.
Whisk together onion, sour cream, mayonnaise, dill, and reserved cooking water in a bowl until blended. Whisk in salt and pepper to taste, then add to potatoes and toss to coat. Serve warm.