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The Parker House Hotel's 1856 masterpiece: two layers of tender butter cake embracing silky vanilla pastry cream, crowned with a glossy dark chocolate glaze that pools at the edges like a promise kept.
Boston Cream Pie is neither Boston's invention nor a pie. It was created in 1856 by an Armenian-French chef named M. Sanzian at the Parker House Hotel, and it's a cake through and through. The name stuck because nineteenth-century American bakers used the same tins for pies and cakes, and 'pie' simply meant 'round thing from the oven.'
This dessert became so beloved that Massachusetts declared it the official state dessert in 1996, beating out the Toll House cookie and Indian pudding. Walk into any proper New England bakery and you'll find it in the case, that distinctive chocolate glaze identifying it from across the room.
The construction is straightforward: two rounds of tender butter cake, a thick layer of vanilla pastry cream, and a dark chocolate ganache poured over the top until it drips down the sides in lazy rivulets. Each component matters. The cake must be sturdy enough to hold the cream yet tender enough to yield to a fork. The pastry cream needs body without being gluey. The ganache should set to a shine but never harden into a shell.
I've taught this recipe to students who arrived convinced pastry cream was beyond them. It isn't. It requires attention and a good whisk, nothing more. By the time you've made it twice, you'll wonder why you ever bought pudding from a box.
Quantity
2 cups (240g)
Quantity
2 teaspoons
Quantity
1/2 teaspoon
Quantity
1/2 cup (1 stick/113g)
softened
Quantity
1 cup (200g)
Quantity
2
at room temperature
Quantity
2 teaspoons
Quantity
3/4 cup (180ml)
at room temperature
Quantity
2 cups (480ml)
Quantity
1/2 cup (100g)
Quantity
1/4 cup (30g)
Quantity
4
Quantity
2 tablespoons
Quantity
2 teaspoons
Quantity
pinch
Quantity
6 ounces (170g)
finely chopped
Quantity
3/4 cup (180ml)
Quantity
1 tablespoon
Quantity
1 tablespoon
| Ingredient | Quantity |
|---|---|
| all-purpose flour | 2 cups (240g) |
| baking powder | 2 teaspoons |
| fine sea salt | 1/2 teaspoon |
| unsalted butter (for cake)softened | 1/2 cup (1 stick/113g) |
| granulated sugar (for cake) | 1 cup (200g) |
| large eggsat room temperature | 2 |
| pure vanilla extract (for cake) | 2 teaspoons |
| whole milk (for cake)at room temperature | 3/4 cup (180ml) |
| whole milk (for pastry cream) | 2 cups (480ml) |
| granulated sugar (for pastry cream) | 1/2 cup (100g) |
| cornstarch | 1/4 cup (30g) |
| large egg yolks | 4 |
| unsalted butter (for pastry cream) | 2 tablespoons |
| pure vanilla extract (for pastry cream) | 2 teaspoons |
| fine sea salt (for pastry cream) | pinch |
| semi-sweet chocolatefinely chopped | 6 ounces (170g) |
| heavy cream | 3/4 cup (180ml) |
| light corn syrup | 1 tablespoon |
| unsalted butter (for ganache) | 1 tablespoon |
Pour the milk for the pastry cream into a medium saucepan and set over medium heat. While it warms, whisk together the sugar, cornstarch, and salt in a bowl, then add the egg yolks and whisk vigorously until pale and slightly thickened. This takes a full minute of concentrated effort. The color should lighten from deep yellow to lemony.
When the milk steams and small bubbles form at the edges, remove from heat. Pour about half the hot milk into the yolk mixture in a thin stream, whisking constantly. This tempers the eggs, raising their temperature gradually so they don't scramble. Pour this mixture back into the saucepan with the remaining milk, whisking as you go.
Return the saucepan to medium heat and whisk continuously. The mixture will seem thin, then suddenly thicken dramatically around 170°F. Keep whisking and cooking for another full minute after it thickens. You must cook out the raw starch taste. The cream should be thick enough to hold its shape when you lift the whisk.
Remove from heat and whisk in the butter until melted and incorporated, then the vanilla. Pour through a fine-mesh strainer into a clean bowl, pressing with a spatula to catch any bits of cooked egg. Press plastic wrap directly onto the surface to prevent a skin from forming. Refrigerate for at least two hours, or until completely cold.
Position a rack in the center of your oven and heat to 350°F. Butter two 9-inch round cake pans and line the bottoms with parchment paper. Butter the parchment as well, then dust the entire interior with flour, tapping out the excess. This double insurance prevents sticking.
Whisk together the flour, baking powder, and salt in a medium bowl. Sift if your flour is lumpy. Set aside.
In a stand mixer fitted with the paddle attachment, or using a hand mixer, beat the softened butter on medium speed until creamy, about one minute. Add the sugar gradually and beat for three to four minutes until pale and fluffy. The mixture should look almost white and hold soft peaks. Scrape down the bowl halfway through.
Add the eggs one at a time, beating well after each addition until fully incorporated. The mixture may look slightly curdled after the first egg. Add the vanilla with the second egg. Beat until smooth and uniform.
Reduce mixer speed to low. Add the flour mixture in three additions, alternating with the milk in two additions, beginning and ending with flour. Mix just until each addition disappears. Overmixing develops gluten and produces a tough cake. The batter should be thick and smooth, falling from a spoon in lazy ribbons.
Divide the batter evenly between the prepared pans, smoothing the tops with an offset spatula. Bake for 25 to 30 minutes, rotating pans halfway through, until the cakes are golden, spring back when gently pressed in the center, and a toothpick inserted in the middle comes out clean.
Let cakes cool in their pans on a wire rack for ten minutes. Run a thin knife around the edges to release, then invert onto the rack and peel off the parchment. Flip right-side up and cool completely, at least one hour. Warm cake will melt the pastry cream.
Place the finely chopped chocolate in a heatproof bowl. Heat the cream and corn syrup in a small saucepan over medium heat until it just begins to simmer, with small bubbles around the edges. Pour the hot cream over the chocolate and let it sit for two minutes without stirring. The heat needs time to melt the chocolate.
Starting from the center, whisk the chocolate and cream together in slow, small circles, gradually widening until everything is combined. The ganache should be glossy and smooth. Whisk in the butter until melted. Let cool at room temperature for about fifteen minutes, stirring occasionally, until it thickens slightly but still pours easily.
Place one cake layer, flat-side up, on a serving plate. Slide strips of parchment or wax paper under the edges to catch ganache drips. Give the chilled pastry cream a vigorous stir to loosen it, then spread it evenly over the cake, stopping about half an inch from the edge. It should be about three-quarters of an inch thick.
Place the second cake layer on top, flat-side up for the smoothest surface. Press down gently to level. Pour the ganache onto the center of the cake. Using an offset spatula or the back of a spoon, spread it toward the edges, encouraging it to drip down the sides in natural rivulets. Some irregular coverage is traditional and honest.
Refrigerate the assembled cake for at least thirty minutes to set the ganache. Remove the parchment strips carefully. Serve chilled or at cool room temperature, slicing with a sharp knife dipped in hot water and wiped clean between cuts.
1 serving (about 190g)
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