Turnip Gratin

2 tablespoons unsalted butter 2 1/2 pounds medium turnips, trimmed and left unpeeled 1 tablespoon chopped thyme 1/2 tablespoon chopped savory 1 1/2 teaspoons kosher salt Rounded 1/8 teaspoon cayenne 1 cup heavy cream 1 cup grated parmesan Preheat oven Read on!