4 cups (1½ pounds) red cherries, stemmed and pitted
¼ cup kirsch cherry brandy
¼ cup granulated sugar
2 tablespoons butter, unsalted
1 teaspoon ground cardamom
¼ teaspoon kosher salt
1 tablespoon cornstarch
2 cups heavy cream
2 tablespoons confectioners' sugar
½ teaspoon kosher salt
Grapefruit curd
Pound cake cubes
Grapefruit pastry cream
1 cup blueberries
Stewed cherries
½ cup pistachios, roughly chopped
½ cup cherries—stemmed, pitted and halved
Directions
Make the pound cake: Preheat the oven to 350°. Grease and flour a 9-by-5-inch loaf pan. In a medium bowl, toss the blueberries with the sugar, mashing slightly to release some of the juices. Let them sit at room temperature for 30 minutes, stirring occasionally, to macerate.
Meanwhile, in a medium bowl, whisk together the flour with the baking powder and salt. In a large bowl, whisk together the yogurt, olive oil, vanilla and eggs. Stir in the macerated blueberries, followed by the dry ingredients; mix until a smooth batter forms.
Transfer the batter to the prepared loaf pan and bake until golden brown and a cake tester inserted into the center of the cake comes out clean, 1 hour to 1 hour and 10 minutes. Let cool completely, then cut into 1-inch cubes.
While the pound cake bakes, make the grapefruit curd: In a small saucepan, whisk together the sugar, grapefruit juice, cornstarch, salt, eggs and egg yolks until smooth, then place over medium heat. Cook, stirring constantly, until thickened, 9 to 11 minutes. Remove from the heat and strain, then stir in the butter and grapefruit zest until smooth. Cool over an ice bath. Then chill until firm, 2 hours.
Make the stewed cherries: In a medium saucepan, combine all the cherry ingredients, except the cornstarch. Bring to a simmer over medium-high heat and cook until the cherries have softened, 8 to 10 minutes. Remove from the heat.
In a small bowl, mix the cornstarch with 2 tablespoons of juice from the cherry mixture until smooth. Then add that to the pot. Return the saucepan to the stovetop and bring the mixture to a boil. Cook until thickened, 2 minutes, and remove from the heat to cool over an ice bath.
Make the grapefruit pastry cream: In a large bowl, combine the cream, confectioner's sugar and salt, and, using an electric hand mixer, whip to stiff peaks. Set 1½ cups of the whipped cream aside. Fold the remaining whipped cream into the grapefruit curd until smooth.
Assemble the trifle: In a 3-quart trifle bowl, layer one-third of the pound cake cubes, followed by one-third of the grapefruit pastry cream, ¼ cup of the blueberries, one-third of the stewed cherries and 2 tablespoons of the pistachios. Repeat this layering process 2 more times to fill the trifle bowl. Spread the reserved whipped cream over the top layer, then garnish with the remaining ¼ cup of blueberries, the remaining 2 tablespoons of pistachios and the halved cherries. Serve immediately or refrigerate for up to 4 hours.