Rating: 4.5 stars
10 Ratings
  • 5 star values: 6
  • 4 star values: 4
  • 3 star values: 0
  • 2 star values: 0
  • 1 star values: 0

No heavy cream or butter is needed for this comforting side dish of Two-Potato Gratin when you start with high-flavor, nutty-intense Gruyere and Parmigiano-Reggiano cheeses.

Recipe by Cooking Light December 2012

Gallery

Credit: Romulo Yanes; Styling: Philippa Brathwaite

Recipe Summary

hands-on:
30 mins
total:
1 hr 40 mins
Yield:
Serves 8
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Ingredients

Ingredient Checklist

Directions

Instructions Checklist
  • Preheat oven to 350°.

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  • Place potatoes in a large stockpot; cover with stock. Bring mixture to a boil; cook 4 minutes. Remove from heat. Carefully remove potatoes from pot using a slotted spoon, reserving cooking liquid. Arrange potato slices in a single layer on a jelly-roll pan; set aside. Strain cooking liquid through a fine-mesh sieve over a bowl; reserve 1 cup cooking liquid. Discard solids and remaining cooking liquid.

  • Heat a medium saucepan over medium heat. Add oil to pan. Sprinkle flour over oil; cook 1 minute, stirring constantly with a whisk. Add garlic; cook 2 minutes, stirring frequently. Combine milk and reserved 1 cup cooking liquid. Gradually pour milk mixture into flour mixture in pan, stirring constantly with a whisk. Add thyme sprigs to pan. Bring mixture to a boil; cook 4 minutes or until slightly thick, stirring frequently. Remove from heat. Strain mixture through a fine-mesh sieve over a bowl, reserving sauce; discard solids. Stir 1/2 teaspoon salt, pepper, and Gruyère cheese into sauce.

  • Spread 1/2 cup sauce in bottom of a broiler-safe 2-quart ceramic baking dish coated with cooking spray. Arrange a single, flat layer of sweet potato and then baking potato slices over sauce. Over flat layer, alternate baking potato and sweet potato slices, in shingle-like fashion. Sprinkle evenly with remaining 1/4 teaspoon salt, 1 tablespoon chives, and chopped thyme; pour remaining sauce over potato mixture. Sprinkle with Parmigiano-Reggiano cheese. Bake at 350° for 1 hour or until potatoes are tender when pierced with a knife.

  • Remove gratin from oven. Preheat broiler to high.

  • Place gratin in oven. Broil gratin 3 minutes or until browned. Sprinkle with remaining 1 tablespoon chives.

Nutrition Facts

218 calories; fat 9g; saturated fat 3.5g; mono fat 3.8g; poly fat 1.3g; protein 9.3g; carbohydrates 25.2g; fiber 2.7g; cholesterol 18mg; iron 1.2mg; sodium 339mg; calcium 228mg.
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