Storage: This gratin is best served fresh but can be reheated gently. Allow to cool completely before covering and refrigerating for up to 2 days.
Substitutions: Use Yukon Gold or Maris Piper potatoes for the best results. Avoid waxy potatoes like Red Bliss as they will not thicken the sauce properly.
Tips: The key to this recipe is gentle, slow cooking. Do not rush the baking process, or the texture will not become silky.
Variations: Serve with any plainly cooked poultry or roast meat as suggested by the original author.