Ingredients

  • 2 pounds whitefish fillets
  • 2 tablespoons Dijon mustard
  • 2 cloves garlic, minced (green part removed)
  • Juice 1/2 lemon
  • 2 tablespoons safflower oil
  • 2 tablespoons fresh thyme (or 2 teaspoons dried)
  • 2 large sweet potatoes
  • Coarse salt and freshly ground pepper
  • 1 tablespoon unsalted butter
  • 1 medium onion, thinly sliced
  • 1/4 to 1/2 cup creme fraiche
  • 1/2 teaspoon Hungarian paprika

Method

  • Wipe the whitefish fillets dry with paper towels.
  • In a small bowl combine the mustard, garlic, lemon juice, safflower oil and thyme.
  • Spread the mixture over the fillets and let sit for an hour.
  • Preheat oven to 400 degrees.
  • Peel the sweet potatoes and slice them thin, using a food processor if you like.
  • Arrange them in a shallow baking dish that will hold the fillets comfortably in one layer.
  • Sprinkle them with salt and pepper and dot with butter.
  • You may need to make two layers or more of potato.
  • Add the onion and half of the creme fraiche, spreading it over the potatoes, just enough to moisten.
  • Sprinkle with paprika, cover and bake for 20 minutes.
  • Remove the sweet potatoes from the oven and spread the fillets over the top.
  • Pour the rest of the cream evenly over the fillets.
  • Bake, uncovered, until the fish flakes with a fork, and the potatoes are soft, about 20 minutes.