Root vegetable gratin

Ingredients

1 tbsp. butter
2 lb. russet potatoes, peeled and thinly sliced, about 5 cups total
8 oz. carrots, peeled and thinly sliced, about 1 1/2 cups total
4 oz. celery root, peeled and thinly sliced
1 1/4 cups grated sharp cheddar cheese
Salt and freshly ground pepper, to taste
2 cups whipping cream
2 tbsp. chopped green onion

Directions

Preheat oven to 400 degrees. Place butter in a 13-by-9-by-2-inch glass baking dish and put the dish in the oven while it preheats so the butter will melt. Remove the dish from the oven and tilt until the bottom is covered with melted butter. Layer half the vegetables in the dish, beginning with the potatoes. Top with half the cheese. Layer the remaining vegetables over the cheese, ending with potatoes. Sprinkle with salt and pepper. Pour cream over vegetables and top with the remaining cheese. Cover dish with foil and bake 30 minutes. Uncover and continue baking until the vegetables are tender and the top is golden, about 35 minutes longer. Let the gratin cool about 15 minutes, then sprinkle with chopped green onion before serving.  

Serves 8