2 pounds medium Yukon Gold potatoes (6 to 8 potatoes)
Kosher salt
1 cup good mayonnaise
2 tablespoons freshly squeezed lemon juice
2 tablespoons tarragon or white wine vinegar
1 teaspoon freshly ground black pepper
3 tablespoons chopped scallions, white and green parts
3 tablespoons minced red onion
2 tablespoons minced fresh tarragon leaves
2 tablespoons minced fresh dill