3 root au gratin Recipes

all purpose flower, butter, dijon mustard, green apples, peeled, cored and thinly sliced, celeriac root, peeled quartered and thinly sliced, russet potatoes, peeled and thinly sliced, salt and white pepper to taste, shredded cheddar cheese, divided, shredded montery cheese, divided, whole milk

yukon gold potatoes, peeled and thinly sliced, rutabaga, peeled, halved and thinly sliced, turnip, peeled and thinly sliced, parsnip, peeled and thinly sliced, heavy whipping cream, minced fresh rosemary or 2 tsp dried rosemary, crushed, king arthur unbleached all-purpose flour, seasoned salt, shredded gruyere or swiss cheese