Lyonnaise Potatoes Recipe

Ingredients (7)

• 1 1/2 pounds (680g) Yukon Gold potatoes (about 4 medium potatoes), peeled and cut into 1/4-inch-thick rounds
• 2 tablespoons (18g) Diamond Crystal kosher salt, plus more to taste; for table salt use half as much by volume or the same weight
• 2 tablespoons (30ml) distilled white vinegar
• 5 tablespoons (75g) melted homemade or store-bought clarified butter, divided
• 1 large sweet onion (8 ounces; 225g), thinly sliced
• Freshly ground black pepper
• Finely chopped flat-leaf parsley leaves and tender stems, for garnish