Salmon, Leek & Potato Gratin
  1. Heat oil in a saucepan over medium heat. Sauté garlic, lemon zest & thyme for 2 minutes. Add flour & cook 1 minute, stirring to combine. Remove from heat & gradually add the milk, stirring constantly, then return to the heat & cook, stirring until thickened.
  2. Add salt, pepper, Dijon mustard & 3/4 cup of the combined parmesan & Gruyere cheese (reserving 1/4 cup) & stir until the cheese melts. Remove from the heat & stir in the parsley & lemon juice.
  3. Preheat oven to 400 F. Grease an 8-inch square baking dish lightly with olive oil.
  4. Wash & pare potatoes (leave the skin on if you prefer). Slice very thinly; place one sliced potato in a layer on the bottom of the baking dish, overlapping slightly.
  5. Arrange one third of the sliced leek & salmon evenly on top, then spoon one quarter of the cheese sauce over all. Repeat the layers with the remaining potatoes, leek & salmon, finishing with the final layer of potato & topping with the last quarter of the cheese sauce.
  6. Sprinkle with reserved 1/4 cup grated cheese. Cover with foil & bake for 45 minutes, then remove the foil & bake for a further 30 minutes. Allow the gratin to stand 10 minutes before serving.
Recipe Notes
  • If your making this for a ‘special’¬†occasion, you may want to make them in individual servings as I did in the picture. I used 5-inch round pans with removeable bottoms & lined them with parchment paper so they couldn’t leak.