1/2 cup prepared horseradish cream

1/4 cup olive oil

1 tablespoon white balsamic vinegar

2 tablespoons creme fraiche

1/2 lime, freshly squeezed

Finely chopped fresh herbs such as chives, dill or parsley, optional

Lemon slices and parsley sprigs for garnish

1. Heat oil in a medium skillet and sauté carrots and leeks over medium heat until softened, about 5-7 minutes. Allow to cool for 10 minutes.

2. Preheat the oven to 350 F. Lightly coat a large (91/2-inch x 51/2-inch x 2 1/2-inch) loaf pan with cooking spray.

3. Beat the eggs with the matzo meal in a large bowl with an electric mixer. When well combined, add the broth, cooled carrots and leeks, salt, pepper and sugar, and continue to beat until well blended. Add the whitefish and salmon and mix well, making sure the ground fish is completely blended with the other ingredients.

4. Pour the fish mixture into the prepared pan. Pick up the pan with both hands and slam down on counter to settle any air bubbles. Sprinkle with the lime juice. Bake for about 45 to 50 minutes or until a long wooden skewer inserted in the just center comes out clean. (Start checking after 45 minutes.) Remove the terrine from the oven and allow it to cool for half an hour. Cover with foil and chill overnight.

5. For the horseradish cream: Combine all ingredients in a small bowl and whisk well, making sure the oil is emulsified. Taste for seasoning. Transfer to a serving dish, cover and refrigerate.

6. To serve: run a knife around the edges of the pan and invert it onto some foil. Turn it back over onto a rectangular platter. Slice into serving pieces, overlapping them on the platter, and garnish with lemon slices and parsley. Or serve on individual plates on a bed of arugula. Serve with the horseradish-herb cream.

Advance Preparation: The terrine and sauce can be made 2 days ahead and refrigerated.

(Diane Rossen Worthington is an authority on new American cooking. She is the author of 20 cookbooks, including most recently "Seriously Simple Parties" (Chronicle Books, 2012), and also a James Beard award-winning radio show host. You can contact her at www.seriouslysimple.com.)