Spread the filling on each layer, then top with a dusting of powdered sugar on top.
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Martha Stewart's Pistachio Cannoli Cake (my changes in italics)10 tablespoons unsalted butter, room temperature, plus more for pans
1 ½ cups unbleached all-purpose flour, plus more for pans
½ cup plus 3 tablespoons shelled unsalted pistachios (3 ½ ounces) (Use more because the side won't be covered properly otherwise)
1 ½ teaspoons baking powder
¼ teaspoon baking soda
1 teaspoon kosher salt
1 cup granulated sugar
¼ teaspoon orange-flower water (optional) (I used 1 teaspoon)
2 large eggs plus 2 large yolks, room temperature
1 cup sour cream, room temperature
Filling
2 ¾ cups fresh ricotta (about 1 ½ pounds) (I used 4 cups)
¾ cup heavy cream (I omitted this - not needed)
¼ teaspoon kosher salt
1 teaspoon pure vanilla extract
¼ teaspoon ground cinnamon
¾ cup confectioners' sugar, plus more for serving (I used 1 1/4 cups)
4 ounces semisweet chocolate, coarsely chopped (¾ cup), plus 2 ½ ounces more, melted (½ cup) (I would use mini chocolate chips to keep the ricotta whiter-looking since the shards I chopped turned the ricotta beige)
4 ounces candied orange peel, cut into a ¼-inch dice (I used more)
Preheat oven and prep cake pans:
Cake: Preheat oven to 350°F. Butter two 8-by-2-inch round cake pans. Line pans with parchment; butter parchment. Dust with flour, tapping out excess.
Grind pistachios; reserve some and process rest with dry ingredients:
In a food processor, finely grind pistachios. Remove and reserve 1/4 cup ground pistachios, then add flour, baking powder, baking soda, and salt to processor and pulse to combine.
Beat butter; add yolks one at a time:
Beat butter with granulated sugar on medium-high speed until light and fluffy, about 2 minutes. Add orange-flower water; beat to combine. Beat in eggs and yolks, one at a time, thoroughly combining after each addition and scraping down bowl as needed.
Add pistachio mixture and sour cream:
Add pistachio mixture to egg mixture in three batches, alternating with sour cream and beginning and ending with pistachio mixture.
Divide batter between pans and bake:
Divide batter evenly between cake pans; smooth tops with an offset spatula. Bake, rotating pans once, until tops spring back when lightly touched, 30 to 35 minutes.
Cool cakes, then refrigerate:
Transfer pans to a wire rack; let cool 10 minutes. Turn cakes out onto rack; remove parchment and let cool 1 hour. Wrap in plastic and refrigerate at least 1 hour and up to overnight.
Make filling:
Meanwhile, combine ricotta and cream in bowl of food processor; process until smooth. Add salt, vanilla, cinnamon, and confectioners' sugar; process to combine. Transfer mixture to a bowl and stir in chopped chocolate and orange peel. Refrigerate in an airtight container at least 1 hour and up to 2 days.
Cut cake to create layers; stack and brush with melted chocolate and pistachios:
Cut each cake horizontally into 2 layers. Stack on a cardboard cake round or a plate; brush edges with melted chocolate, then pat some of reserved ground pistachios onto chocolate. Separate, then refrigerate in a single layer until set, 10 minutes.
Assemble cake:
Place one cake layer on a cake stand, bottom-side down; spread 1 1/2 cups filling evenly over top, then place second layer on top. Repeat with remaining filling and cakes, finishing with a cake layer, bottom-side up. Refrigerate at least 1 hour and up to overnight. Sprinkle with confectioners' sugar and remaining reserved ground pistachios for serving.