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1
Fit a sieve over a bowl and line it with two layers of cheesecloth. Pour the yogurt into the sieve, cover with plastic wrap, and refrigerate for 6 to 8 hours to drain. Discard the liquid, and measure out 11/4 cups of the drained yogurt; set aside.
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2
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. Combine the lemon juice and sugar in a small saucepan and bring to a boil over medium-high heat, stirring to dissolve the sugar. Remove from the heat and let cool.
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3
Mix about 2 tablespoons of the milk with the cornstarch in a small bowl to make a smooth slurry. Whisk the cream cheese in a medium bowl until smooth. Fill a large bowl with ice and water.
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4
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.
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5
Gradually whisk the hot milk mixture into the cream cheese until smooth. Add the reserved 11/44 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.
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6
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.
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7
: 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.
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8
: Toss the berries with the sugar, honey, and wine in a bowl and let sit for at least 30 minutes and up to 6 hours, to macerate. The berries will create their own lovely syrup.
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9
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.
