Indulgent Potatoes Lyonnaise

INDULGENT POTATOES LYONNAISE 4 medium russet potatoes, peeled and thinly sliced Kosher salt/black pepper to taste 6 T. butter, divided 1 medium onion, thinly sliced 1 T. minced fresh rosemary 1. In large saucepan or Dutch oven, combine potatoes, salt…