Boston Cream Pie al Prosecco

The Boston cream pie was created at the Parker House Hotel in Boston, Massachusetts, which opened in October 1856, and the hotel's French chef, M. Sanzian, is credited with the dessert, originally called "Parker House Chocolate Cream Pie." It has been served continuously at the Parker House Restaurant since the hotel's opening, which makes it one of the oldest continuously served desserts in America, and in 1996 the Commonwealth of Massachusetts designated it the official state dessert, over the Boston cream donut and the Fig Newton.

It is a cake, not a pie, and the name is a matter of baking equipment. In the 1850s, pie tins were more common in American kitchens than cake pans, so the sponge was baked in a pie tin, filled with custard, and glazed with chocolate, and the "pie" name stuck. The original Parker House version used a French pâte à choux-based sponge, a rum-spiked crème pâtissière, and a chocolate fondant glaze poured over the top.

Our Mimosavated version infuses the custard with a splash of Prosecco di Valdobbiadene, the bright, slightly acidic Italian sparkling wine, which adds a floral note to the vanilla custard and lifts the whole dessert.

Ingredients (serves 10):

The Sponge Cake: - 7 oz all-purpose flour - 2 teaspoons baking powder - ½ teaspoon salt - 5 ¼ oz granulated sugar - 3 ½ oz unsalted butter, melted - 2 large eggs, room temperature - 2 large egg yolks, room temperature - ¾ cup whole milk, warmed - 1 teaspoon vanilla extract

The Prosecco Custard Filling: - 2 ⅛ cups whole milk - 6 large egg yolks - 3 ½ oz granulated sugar - 1 ⅓ oz cornstarch - 3 ⅓ tbsp Prosecco di Valdobbiadene - 1 teaspoon vanilla extract - Seeds of ½ vanilla pod - 1 oz unsalted butter, room temperature - A pinch of salt

The Chocolate Ganache Topping: - 7 oz dark chocolate (60% cocoa), chopped - ⅔ cup heavy cream - 1 oz unsalted butter - 1 tablespoon Prosecco di Valdobbiadene (optional) - A pinch of salt

Making the Sponge Cake: Preheat the oven to 347°F (350°F). Butter and flour two 7 ⅞ in (8-inch) round cake pans and line the bottoms with parchment paper.

In a medium bowl, whisk together the flour, baking powder, and salt. In a large bowl, whisk together the sugar, melted butter, eggs, and egg yolks until smooth. Gradually add the dry ingredients, alternating with the warm milk and vanilla, mixing just until combined — don't overmix.

Divide the batter evenly between the two prepared pans. Bake for 20–25 minutes, until a skewer inserted into the center comes out clean. Let cool in the pans for 10 minutes, then turn out onto wire racks to cool completely.

Making the Prosecco Custard: In a saucepan, heat the milk with the vanilla pod seeds (and the empty pod) until just below boiling. Remove from heat and let steep for 10 minutes, then remove the pod.

In a bowl, whisk together the egg yolks, sugar, cornstarch, and salt until thick and pale. Gradually whisk in the warm milk, then the Prosecco. Return to the saucepan and cook over medium-low heat, whisking constantly, until the custard thickens and comes to a boil — cook for 2 more minutes to cook out the cornstarch.

Remove from heat and whisk in the butter and vanilla extract. Transfer to a bowl, cover with plastic wrap directly on the surface, and chill completely. Before using, whisk the chilled custard until smooth.

Making the Chocolate Ganache: Heat the cream until just below boiling. Place the chopped chocolate in a heatproof bowl and pour the hot cream over it. Let sit for 2 minutes, then stir until smooth and glossy. Stir in the butter, Prosecco (if using), and salt until completely incorporated. Let cool until it reaches a spreadable but still pourable consistency — about 15–20 minutes at room temperature.

Assembling: If the cake layers have domed, use a serrated knife to level them. Place the first layer on a serving plate and spread the chilled Prosecco custard evenly over the top, leaving a ⅓ in border around the edge. Place the second cake layer on top, pressing gently.

Pour the chocolate ganache over the top of the cake, allowing it to drip slightly down the sides. Use an offset spatula to smooth the top if needed. Let the ganache set for 30–60 minutes before slicing.

Serving: Slice with a hot, clean knife — dip in hot water and wipe between cuts for pristine slices. Serve at room temperature.

The Mimosa Pairing Logic: Since the custard contains Prosecco, pair with a classic Prosecco mimosa — orange juice and Prosecco. The bright citrus complements the chocolate and the vanilla custard. A peach bellini mimosa is also excellent — the peach echoes the Moscato-like fruitiness of the Prosecco. Avoid heavy or bitter mimosas — Boston cream pie is rich and comforting, and you need something light and bright to balance it.

Reference Links: - Boston cream pie on Wikipedia (Parker House Hotel, 1856, state dessert): Wikipedia - The Original Boston Cream Pie at Omni Parker House: Historic Hotels of America - How Omni Parker House's Boston Cream Pie Became Local Legend: Eater Boston - Prosecco di Valdobbiadene: Wikipedia

Make-Ahead: The sponge cake layers can be baked up to 2 days ahead and stored, well-wrapped, at room temperature or frozen for up to 1 month. The custard can be made up to 3 days ahead and refrigerated. The ganache can be made up to 5 days ahead and refrigerated — gently reheat until pourable. The assembled cake can be refrigerated for up to 2 days; bring to room temperature before serving for the best flavor and texture.

Pro Tips: Use a hot milk sponge — warming the milk before adding it to the batter creates a finer, more tender crumb. Don't overmix the batter — overmixing develops gluten and makes the cake tough. Make sure the custard is completely chilled before assembling — warm custard will melt into the cake and make it soggy. Cover the custard with plastic wrap directly on the surface while chilling — this prevents a skin from forming. The ganache should be pourable but not runny — if it's too thin, let it cool longer; if too thick, gently warm it. Let the assembled cake rest for at least 30 minutes before slicing — this allows the ganache to set and the custard to firm up, giving you clean slices. Use a hot knife for cutting — dip in hot water and wipe between each cut for pristine, professional slices.