Boil the potatoes. Add the potatoes to a large pot, cover with cold water by about an inch, and stir in LOTS of salt. You want the water to taste like the sea! Bring to a boil and cook until just fork-tender, about 8 to 10 minutes for creamer-size potatoes. Check early, they cook quickly!
3 pounds baby yellow potatoes, 4 to 5 tablespoons kosher salt
Drain and season. Drain the potatoes (don't rinse!) and immediately transfer them to a large bowl. While still steaming hot, drizzle with 1 teaspoon white wine vinegar and sprinkle with 1 teaspoon kosher salt. Toss gently and let sit for 5 to 10 minutes to absorb the seasoning.
1 teaspoon white wine vinegar, 1 teaspoon kosher salt
Whisk the dressing base. In a medium bowl, combine the sour cream, mayonnaise, Dijon mustard, white wine vinegar, salt and white pepper. Whisk until smooth.
1 ¼ cups full-fat sour cream, ¼ cup mayonnaise, 2 tablespoons Dijon mustard, 1 tablespoon white wine vinegar, ¾ teaspoon white pepper, ½ to 1 teaspoon kosher salt
Add the lemon zest. Zest the lemon directly into the bowl.
1 tablespoon lemon zest
Fold in the mix-ins. Add the shallot, baby pickles, capers, and chives. Stir to combine.
¼ cup shallot, ⅓ cup baby pickles, 1 tablespoon capers, 2 tablespoons fresh chives
Add the dill and eggs. Fold in the fresh dill and diced hard-boiled eggs. Taste and add more salt if needed (up to 1 teaspoon total).
⅓ to ½ cup fresh dill, 3 large hard-boiled eggs
Combine. Once the potatoes have cooled to room temperature, pour the dressing over the top and gently fold with a rubber spatula until every potato is coated.
Chill. Cover the bowl and refrigerate for at least 2 hours, or overnight for best flavor.
Serve. Right before serving, give it a gentle stir and taste for seasoning. Transfer to a serving bowl and top with the halved hard-boiled egg, fresh dill fronds, baby pickle halves, flaky sea salt, and a final crack of white pepper.