Ingredients
Cake
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2 cups unsalted butter (16 ounces), at room temperature, plus more for Bundt pan
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4 cups all-purpose flour (about 17 ounces), plus more for Bundt pan
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¾ cup (6 ounces) Moscato d'Asti
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2 teaspoons fresh lemon juice
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1 teaspoon vanilla extract
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3 cups granulated sugar
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1 teaspoon fine sea salt
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6 large eggs, at room temperature
Grape Glaze
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½ cup freeze-dried seedless red grape slices (about 1 ounce)
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1 cup powdered sugar (about 4 ounces), divided
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2 tablespoons plus 1 1/2 teaspoons (1 1/4 ounces) Moscato d'Asti or fresh lime juice, divided
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1 pinch of fine sea salt
Directions
Make the Cake
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Preheat oven to 300°F. Butter and flour a 10-inch (14-cup) Bundt pan; set aside. Stir together Moscato, lemon juice, and vanilla in a small bowl; set aside.
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Beat butter in a stand mixer fitted with the paddle attachment on medium speed until pale yellow and creamy, about 5 minutes. Gradually add sugar and salt, beating until light and fluffy, about 5 minutes, stopping to scrape sides of bowl as needed. Add eggs, 1 at a time, beating well after each addition and stopping to scrape sides of bowl as needed. Reduce mixer speed to low; gradually add flour alternately with Moscato mixture, beginning and ending with flour, beating until blended after each addition. Spoon batter into prepared Bundt pan, and smooth top.
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Bake in preheated oven until a wooden pick inserted into cake comes out clean, 1 hour and 40 minutes to 1 hour and 50 minutes. Let cake cool in pan 15 minutes. Remove cake from pan; let cool completely on wire rack, about 2 hours.
Make the Grape Glaze
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Process grape slices and 1/4 cup powdered sugar in a spice grinder or food processor until a fine powder forms, about 30 seconds. Sift through a fine wire-mesh strainer into a small bowl; discard any clumps. Whisk 2 tablespoons Moscato or lime juice, salt, and remaining 3/4 cup powdered sugar into grape powder. Whisk in remaining 1 1/2 teaspoons Moscato or lime juice, 1/2 teaspoon at a time, until glaze reaches desired consistency. Spoon grape glaze over cake. Let cake stand until grape glaze hardens, about 15 minutes.
Make Ahead
Cake can be made and glazed up to 1 day ahead and stored in an airtight container at room temperature.
Note
Find freeze-dried grapes in the produce section of the supermarket or online at nuts.com.