3 pounds baby Yukon Gold potatoes , or fingerling potatoes, scrubbed but not peeled
1 cup extra-virgin olive oil
1/4 cup Champagne vinegar
Kosher salt and freshly ground black pepper
2 (about 4 cups) celery hearts, thinly sliced
2 bunches radishes, thinly sliced
8 (1 cup) small scallions, white and light green parts only, thinly sliced
How to Make It
Bring a large pot of salted water to a boil. Add the potatoes and cook until tender, about 20 minutes. Drain and let cool slightly. Slice the potatoes 1/2 inch thick.
Meanwhile, in a large bowl, whisk the olive oil with the vinegar and season with salt and pepper. Gently fold in the potatoes and celery. Let stand at room temperature until cool, about 30 minutes. Just before serving, fold in the radishes and scallions and season with salt and pepper.