This ambrosial sundae is eagerly anticipated each summer at our shops. We usually use tawny port, but it works well with almost any wine or spirit. You can add roughly chopped peaches, apricots, or plums, or substitute them for the berries.
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To assemble the sundaes:
Divide the macerated fruit among 6 plates (or assemble the sundaes in wide-mouthed Mason jars). Place 2 small scoops of frozen yogurt on top of the fruit, then garnish each sundae with a large dollop of whipped cream and an herb sprig.
For the lemon syrup:
Using a vegetable peeler, remove the zest in large strips from 1 lemon; reserve for the frozen yogurt (leave the lemon zest in large strips so it's easier to strain out later). Juice enough of the lemons to make 1/2 cup.
Whisk the cream cheese in a medium bowl until smooth.
Fill a large bowl with ice and water.
Combine the remaining milk, the cream, sugar, corn syrup, and lemon zest in a 4-quart saucepan, bring to a rolling boil over medium-high heat, and boil for 4 minutes. Remove from the heat and gradually whisk in the cornstarch slurry.
Bring the mixture back to a boil over medium-high heat and cook, stirring with a heatproof spatula, until slightly thickened, about 1 minute. Remove from the heat.
Gradually whisk the hot milk mixture into the cream cheese until smooth. Add the reserved 1 1/4 cups yogurt and the lemon syrup and whisk until smooth. Pour the mixture into a 1-gallon Ziploc freezer bag and submerge the sealed bag in the ice bath. Let stand, adding more ice as necessary, until cold, about 30 minutes.
Remove the zest from the frozen yogurt base. Pour into the frozen canister and spin until thick and creamy.
Pack the frozen yogurt into a storage container, press a sheet of parchment directly against the surface, and seal with an airtight lid. Freeze in the coldest part of your freezer until firm, at least 4 hours.
A few hints: Invest in a balloon or piano whisk, which has more wires than a regular whisk; these whisks incorporate the air into the cream faster than a standard whisk. If you can find nonhomogenized cream from a local dairy, the cream will whip up faster and the whipped cream will have a lovely light yellow hue. And chill the bowl. The colder the cream and the bowl, the faster the cream will whip and thicken.
For some desserts, like Oslo Ambrosia, I like to whip the cream to soft peaks. For others, I whip it to a firmer stage so that it will sit on the top of the sundae or other dessert in the traditional way. And if you do overwhip the cream slightly, so it begins to turn a bit bumpy, just add a tablespoon of fresh cream and whisk lightly to smooth it out.
Chill a large metal or glass bowl in the refrigerator for at least 15 minutes; it should be cold to the touch. Add the cream, sugar, and vanilla to the chilled bowl and whip by hand mixer. Use immediately, or refrigerate for up to 1 hour.