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Polpettone di Tonno (Tuna Loaf) with Horseradish Green Sauce

<em>Polpettone di Tonno</em> (Tuna Loaf) with Horseradish Green Sauce Related:   appetizers, dairy, fish, gluten-free, pareve, Passover, Rosh Hashanah, Yom Kippur

Prep time: 40 minutes

Cook time: 45 minutes

Yield: 10–14 slices tuna loaf; about 1/3–½ cup salsa verde

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This Italian-inspired recipe offers a fresh flavorful alternative to traditional gefilte fish for holiday meals. I’ve boosted the flavor and texture with the addition of artichokes and a topping of salsa verde—green sauce, which I’ve enhanced with horseradish in a nod to gefilte-fish tradition. The Parmesan cheese can be omitted if you need a nondairy dish. The dish is gluten-free and Passover-friendly.

Note that you will need cheesecloth and twine. Be sure to wrap the loaf tightly so it retains its form after cooking. Since it is not ideal to puncture the loaf with a thermometer to determine whether it has reached the government-recommended safe temperature (160 degrees) for dishes containing raw eggs, I recommend using pasteurized eggs for this dish.

Ingredients

  • Tuna
  • 3 5-ounce cans yellowfin tuna, packed in olive oil, drained
  • 1½ cups cooked mashed potato, from about one large russet potato (see note below)
  • ½ cup finely chopped canned artichoke hearts, well drained (set aside tough leaves for another use)
  • ½ cup grated Parmesan cheese (optional)
  • ¼ teaspoon freshly ground black pepper
  • 2 egg yolks, preferably from pasteurized eggs
  • Cheesecloth, a double-layer approximately 16-by-16 inches, and 2 short pieces of kitchen twine
  • Extra-virgin olive oil
  • 1 clove garlic, slivered
  • ½ large sweet onion, thinly sliced
  • 1 teaspoon kosher salt
  • 1 cup dry white wine
  • 1 lemon
  • Black olives for garnish (optional)
  • Sauce
  • ¾ cup Italian parsley leaves
  • ¼ cup fresh mint leaves
  • ½ cup baby spinach leaves
  • 2 medium-sized green olives (about 2 teaspoons chopped)
  • 2 tablespoons toasted pine nuts
  • ½ teaspoon vinegar (preferably white wine vinegar)
  • 1 teaspoon fresh finely grated horseradish
  • Freshly ground black pepper to taste
  • ¼ teaspoon (scant) kosher salt
  • 1/3–½ cup good-quality extra-virgin olive oil

Preparation

  • Finely chop the tuna by hand or with a food processor and thoroughly combine it in a bowl with the mashed potato, artichoke hearts, Parmesan (if using), pepper and eggs, breaking up any remaining large chunks. The mixture should be cohesive. Place the cheesecloth on a plate or other surface. Spoon on the mixture near one edge of the cloth and shape the tuna into a roll about 2½ inches in diameter and 9 inches long (make sure it will fit into your cooking pan). Squeeze the roll tightly to ensure the mixture is compact and evenly distributed. Roll the cheesecloth very tightly around it, and twist the ends and tie them with kitchen string.
  • In a wide, deep pan, heat a layer of olive oil over medium heat. Add the garlic and cook, stirring constantly, until garlic is fragrant and starts to brown, 1 to 2 minutes. Stir in the onions and salt, and cook, stirring, 1 to 2 more minutes. Carefully place the tuna roll on top of the onions. Slowly pour the white wine over the top of the roll (don’t pour it directly into the hot oil), then slowly add water to just cover the roll. Bring to a gentle simmer and cook uncovered, gently turning the roll a few times, 40 minutes.
  • Using two large spoons or spatulas to support the ends, carefully transfer the tuna roll to a dish. As soon as it is cool enough to handle, gently remove the cheesecloth. If the roll cracks or separates, firmly reshape it. Cover the dish tightly with foil and refrigerate overnight.
  • Before serving, make the salsa verde by placing all the sauce ingredients except for the olive oil in a blender. Add about ¼ cup of the oil and pulse, processing and adding additional oil until smooth enough to pour. Cover and refrigerate until serving time.
  • To serve, let the tuna roll and sauce sit at room temperature for 10 to 15 minutes. Use a serrated knife to gently slice the roll into ½- to ¾-inch pieces. Arrange slices on a platter or individual serving plates. Cut the lemon in half and squeeze juice over slices. If the sauce is too thick, thin with warm water. Spoon salsa verde over the slices, and, if desired for garnish, add slices from remaining lemon half as well as whole black olives.

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