Celery Root, Carrot, and Potato Gratin Recipe | Saveur

Ingredients

• 5 oz. Gruyère cheese, coarsely grated (1¼ cup)
• 2 cups plain bread crumbs, preferably homemade
• 2 cups heavy cream
• 4 large russet potatoes, peeled and sliced ¼ in. thick
• 4 large carrots, peeled and sliced into ¼-in.-thick coins
• 1 small celery root (1 lb.), peeled, halved, and sliced ¼ in. thick
• 1 large yellow onion, halved and thinly sliced
• 8 garlic cloves, coarsely chopped
• 2 tbsp. fresh thyme leaves
• 8 tbsp. unsalted butter
• 4 fresh bay leaves
• 1 tsp. kosher salt, plus more to taste
• Freshly ground black pepper