Cook the shallot in 3 Tbsp butter in a small saucepan over low heat for 3 minutes. Stir in the flour and cook for 2 minutes more. Whisk in the hot milk all at once, then cook for 20 minutes, stirring frequently, or for 30 minutes in the top of a double boiler. Season with ½ tsp salt, a little white pepper, and the nutmeg. Set the sauce aside.
Preheat the oven to 400°F. Lightly butter or oil a baking dish. Melt 1 Tbsp butter in a medium skillet over medium heat. Add the celeriac with the lemon juice, garlic, and parsley and cook until tender, about 5 to 7 minutes. Season with salt and pepper to taste. Combine the wild rice, celeriac, and sauce and stir in the cheeses. Turn into the dish and bake until firm, about 25 minutes. Sprinkle with chopped parsley and serve.
Notes
Recipe adapted from The New Vegetarian Cooking for Everyone by Deborah Madison
For more amazing recipes featuring vegetables from your CSA boxes, visit our recipe archives!