Key Lime Pie al Moscato

Key lime pie is the state pie of Florida, designated so by the legislature in 2006, and its origin sits in the Florida Keys of the late 1800s. The most repeated story credits a woman known only as Aunt Sally, the cook in the Key West household of William Curry, a ship salvager and Florida's first self-made millionaire, who is said to have adapted a lemon icebox pie to the small, fragrant Key limes that grew in the Keys. The filling sets without baking because the acid of the lime juice reacts with the proteins in the sweetened condensed milk, which was the only milk available in the Keys before refrigeration and the 1930 Overseas Highway. Sweetened condensed milk had been invented by Gail Borden in 1856, and it made the pie possible. A competing claim traces the pie to a Borden test kitchen in New York around 1931, where the first written recipes appeared, but the dish was being made in the Keys long before it was written down.

The genuine article is made with Key limes (*Citrus aurantifolia*), small, yellowish-green, more aromatic and more tart than the larger Persian limes of the supermarket, and a hurricane in 1926 wiped out most of the South Florida Key lime groves, after which growers replanted with the easier Persian lime. Our Mimosavated version infuses the whipped cream topping with Moscato d'Asti, the fragrant, lightly sparkling sweet wine of Piedmont, whose peach and orange-blossom aromas complement the tartness of the Key limes without overwhelming them.

Ingredients (serves 8):

The Graham Cracker Crust: - 7 oz graham cracker crumbs - 3 ½ oz unsalted butter, melted - 1 ⅓ oz granulated sugar

The Key Lime Filling: - 14 ⅛ oz sweetened condensed milk (1 can) - 4 large egg yolks - ½ cup fresh Key lime juice (about 20–25 Key limes — or substitute Persian lime juice mixed with a little extra zest) - Zest of 2 Key limes (organic, unwaxed)

The Moscato Whipped Cream: - 1 ¼ cups heavy cream, cold - 2 ⅔ tbsp Moscato d'Asti - 1 ⅓ oz powdered sugar - 1 teaspoon vanilla extract - Lime zest and Key lime slices, for garnish

Making the Crust: Preheat the oven to 347°F (350°F). Combine the graham cracker crumbs, melted butter, and sugar. Press firmly into the bottom and up the sides of a 9 in (9-inch) pie dish. Bake for 10 minutes until lightly golden. Let cool completely.

Making the Filling: In a bowl, whisk together the sweetened condensed milk and egg yolks until smooth. Gradually whisk in the Key lime juice and zest — the mixture will thicken as the acid reacts with the milk proteins. Pour into the cooled crust.

Bake for 15 minutes — just enough to set the filling slightly. The pie can also be served unbaked, as the acid in the lime juice sets the proteins in the condensed milk naturally, but a brief bake firms it up for cleaner slicing. Let cool to room temperature, then refrigerate for at least 4 hours, ideally overnight.

Making the Moscato Whipped Cream: In a cold bowl, whip the heavy cream to soft peaks. Add the powdered sugar, vanilla, and Moscato d'Asti, and whip to medium-stiff peaks — don't overwhip or it will turn grainy. Spread or pipe over the chilled pie just before serving.

Serving: Slice with a hot, clean knife. Garnish with Key lime slices and a sprinkle of lime zest. The pie should be cold, the cream fresh, the filling tart and creamy.

The Mimosa Pairing Logic: Since the whipped cream contains Moscato d'Asti, pair with a peach bellini mimosa — peach purée and Prosecco. The peach echoes the Moscato and complements the tropical tartness of the Key limes. A blood orange mimosa is also excellent — the blood orange adds a bittersweet citrus note that plays beautifully against the lime. Avoid heavy or creamy mimosas — the pie is already rich and tangy, and you need something light and bright.

Reference Links: - Origin of a Classic: Key Lime Pie (Aunt Sally): Bake from Scratch - Key Lime Pie History: What's Cooking America - The Complicated History of Key Lime Pie: The Daily Meal - Florida state pie designation: Flamingo Magazine - Moscato d'Asti wine guide: Wine Folly

Make-Ahead: The pie can be made up to 3 days ahead and refrigerated. The crust can be baked 2 days ahead. The Moscato whipped cream should be made just before serving — it doesn't hold well. Do not freeze — the custard filling will separate and become grainy.

Pro Tips: Use real Key limes if at all possible — they're smaller, more aromatic, and more tart than Persian limes, and they give the pie its authentic flavor. If you can't find them, use Persian lime juice with extra lime zest to approximate the flavor. Don't use bottled lime juice — it tastes flat and metallic. The filling must be poured into the crust immediately after mixing — the acid continues to set the proteins, and if it sits too long, it will thicken in the bowl. Don't overbake — 15 minutes is enough; the filling should still have a slight wobble. Refrigerate thoroughly before slicing — warm Key lime pie falls apart.