Cover the potatoes with water and bring to a boil. Salt the water and cook until tender, about 10 minutes.
When the potatoes are cooked, return them to the hot pot and douse with a splash of wine or a couple tablespoons of white wine vinegar.
In a bowl, whisk together the goat cheese, yogurt, creme fraiche or sour cream, lemon juice, olive oil, and garlic. Toss the potatoes, dill and scallions in the dressing and season with salt and pepper. Garnish the salad with chopped pickles and thinly sliced radishes and serve.