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Celeriac Potato Au Gratin

A flavorful, savory gratin made with Yukon gold potatoes and celeriac and topped with Gruyere.

  • Total Time: 1 hour 30 mins
  • Yield: 10-12 1x

Ingredients

Units Scale
  • 2 medium-sized celeriac (celery root)
  • 5 Yukon Gold Potatoes (or an all-purpose potato)
  • 4 cups half-and-half (or 3 cups heavy cream + 1 cup whole milk)
  • 1 1/2 cups shredded Gruyere
  • Fresh or dried thyme
  • 1 1/2 teaspoons salt
  • 1/4 teaspoon fresh ground black pepper
  • 1 Tablespoon butter, for baking dish
  • 1 garlic clove, cut in half

Instructions

  1. Preheat oven to 350°F.
  2. To prepare the celeriac – cut off both ends of the celeriac. Use a sharp paring knife to peel the tough outer skin. Just as you would with a potato, remove any dark pits or “eyes”. Soak the celeriac in acidulated water–use 1-2 Tbsp. fresh lemon juice or white vinegar. The celeriac brown quickly when exposed to air. Cut each celeriac into 1/4″ slices. Place the sliced celeriac back in the acidulated water.
  3. Peel and slice the potatoes into 1/4″ slices.
  4. Place the sliced celeriac and potatoes in a large stockpot. Pour the half-and-half (or milk and cream) over the sliced vegetables. Add a good amount of freshly ground black pepper (1/2 tsp.) and salt (about 1-1/2 tsp.) Bring to a simmer over medium heat. Cook until the tip of a knife goes through the slices with a little resistance. (You do not want to cook the potatoes and celeriac until they are completely cooked.)
  5. In the meantime, rub the inside of a 9″ by 13″ glass pan with the garlic halves. Grease the bottom and sides of the pan with a generous amount of butter. Pour the partially cooked vegetables into the prepared pan. Sprinkle the top with the fresh or dried thyme. (I used dry because I was out of fresh–use a little less.) Top with grated Gruyere cheese. Bake for about 30-45 minutes or until the top is brown and bubbly. Let cool slightly before serving.
  6. Serve with roasted or broiled meats, like steak or pork tenderloin.
  • Author: Lindsey Johnson
  • Prep Time: 30 mins
  • Cook Time: 1 hour
  • Category: Side
  • Cuisine: French