Ingredients

• 3 cups chilled heavy cream
• 1/2 cup plus 1 tablespoon sugar
• 1 cup mascarpone cheese (about 9 ounces) at room temperature
• 1 (9-ounce) box chocolate wafers (recommended: Nabisco Famous)
• 1 tablespoon instant espresso powder
• Special equipment: a 9 1/2 to 10-inch springform pan (about 26 cm)

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Instructions

1. Beat 2 cups cream with 6 tablespoons sugar in a bowl with an electric mixer at medium speed until it just holds soft peaks, 2 to 4 minutes. Reduce speed to low, then add mascarpone and mix until combined.
2. Spread 1 1/4 cups mascarpone mixture evenly in bottom of springform pan and cover with 14 wafers, slightly overlapping, if necessary. Spread with another 1 1/4 cups mascarpone mixture, followed by 14 more wafers arranged in the same manner. Spread remaining mascarpone mixture on top. Smooth top with a metal offset spatula, then cover pan with foil and freeze until firm, about 1 hour. Transfer from freezer to refrigerator and chill, covered, until a sharp knife inserted into center cuts through softened wafers easily, about 8 hours.
3. Pulse remaining chocolate wafers in a food processor until finely ground.
4. Beat remaining cup cream with espresso powder and remaining 3 tablespoons sugar using electric mixer at medium speed until it just holds stiff peaks, about 3 minutes.
5. Remove foil and side of pan and frost cake all over with espresso cream. Sprinkle edge of top lightly with wafer crumbs. Serve cold.