Preparation

• 彻底冷却一个大的金属碗和电动搅拌机的搅拌器。在9×5英寸的面包盘的底部和长侧面，并带有12×20英寸的塑料包裹，在长侧面留有4英寸的悬垂。沿侧面并进入角落的塑料平滑；如果有皱纹，没关系。塑料不会完全覆盖短两侧。

鞭打奶油

• Beat the cream in the chilled bowl with the chilled beaters on medium-high speed just until firm peaks form, 1 to 2 minutes. Refrigerate.

Make the zabaglione

• In a 4-quart saucepan, bring 1-1/2 inches of water to a boil over high heat and then lower the heat to maintain a gentle simmer. Put the chocolate in a medium metal bowl and set the bowl over the pan of simmering water; make sure the bottom of the bowl doesn’t touch the water. Melt the chocolate, stirring occasionally, until smooth. Remove the bowl from the pan and let the chocolate cool slightly, stirring occasionally.
• 清洁搅拌器并干燥。将蛋黄，1/4杯糖和牛奶放入一个大金属碗中。将碗放在几乎没有沸腾的水的锅上，以中等速度跳动，经常用硅胶刮刀刮下碗的侧面，直到Zabaglione厚，几乎翻了一番，体积几乎翻了一番，搅拌器在您抬起时离开小径，大约5分钟。将碗从锅中取出，然后将融化的巧克力折叠到Zabaglione中，直至混合。如果这一点看起来颗粒状，没关系；稍后会平滑。搁置。

做酥皮

• 清洁搅拌器并干燥。Return the pan to the heat and maintain the water at a gentle simmer. Put the egg whites, the remaining 1/4 cup of sugar, the cream of tartar, and salt in a large metal bowl and set it over the pan of water. Beat on medium speed, occasionally scraping down the sides of the bowl with a clean silicone spatula, until light, fluffy, and shiny, about 3 minutes. Remove the bowl from the pan and continue beating until the meringue is very thick and billowy, about 2 minutes more.
• In a small bowl, use a fork to mash the cherry jam until loosened a bit; set aside.

Fold and freeze

• 用硅胶刮刀将扎巴氏木轻轻折叠到蛋白甜饼中，然后将其折叠在鲜奶油中，直到没有条纹保留为止。将果酱拖到顶部，然后用几个长而温和的笔触将其折叠起来，以形成漩涡。
• Scrape the mixture into the prepared pan and smooth the top with an offset spatula, scraping off excess if necessary to create a level top. Wrap the overhanging plastic over the top to cover and freeze for at least 6 hours and up to 3 days.

Unmold and serve

• Peel back the plastic wrap from the top of the semifreddo. Invert the pan over a cutting board or serving platter. Lift off the pan, holding the overhanging plastic down on one side and then the other. Remove the plastic wrap. If the semifreddo looks wrinkled, warm a long knife or small offset spatula under hot running water, wipe the blade dry, and run it over the wrinkles to smooth them out.
• Slice the semifreddo crosswise into 1-inch-thick pieces to serve.