Ingredients
1 c. shelled raw unsalted pistachios
1 3/4 c. all-purpose flour
3/4 c. confectioners’ sugar
1 tbsp. confectioners’ sugar
1 1/2 tsp. Coarse salt
1 tbsp. finely grated lime zest
1/2 c. cold unsalted butter
1 large egg yolk
1 large egg
1 c. whole-milk ricotta cheese
2 c. sugar
20 large egg yolks
2 large eggs
6 tbsp. finely grated lime zest
2 c. fresh lime juice
1 c. unsalted butter
1 3/4 c. mascarpone cheese
Preparation
Step 1Make the dough: Whisk together nuts, flour, sugar, salt, and lime zest in a large bowl. Using your fingertips, work in butter until the largest pieces are the size of peas; make a well in center. Whisk yolk and egg in a small bowl, and pour into well. Gradually draw flour mixture into center, kneading until combined. Shape dough into a disk. Wrap in plastic, and refrigerate overnight (up to 3 days).Step 2Start the filling: Place ricotta in a sieve lined with cheesecloth, and set over a bowl. Cover, and refrigerate overnight.Step 3Prepare an ice-water bath; set aside. Whisk sugar, yolks, and eggs in a large heatproof bowl. Whisk in lime zest and juice. Set bowl over a pan of simmering water. Cook, whisking occasionally, until thick, about 30 minutes.Step 4Remove from heat. Add butter, a few pieces at a time, whisking until smooth after each addition. Pour through a fine sieve into a bowl set in ice-water bath. Place plastic wrap directly on surface of lime curd. Let cool. Refrigerate overnight (up to 3 days).Step 5Preheat oven to 325 degrees. Let dough come to room temperature; roll out on a lightly floured surface to 1/4 inch thick. Fit dough into a 10-by-3-inch springform pan, pressing and patching so that dough reaches 2 inches up sides of pan. Line with parchment; fill with pie weights or dried beans. Chill in freezer 15 minutes.Step 6Bake crust 30 minutes. Remove pie weights and parchment. Bake until edge of crust is golden brown and inside is pale golden brown, 15 to 18 minutes. Let cool slightly on a wire rack. Remove sides from pan; and transfer crust to rack to cool completely.Step 7Assemble tart: Spread 2 1/2 cups lime curd over crust. Put ricotta and mascarpone into the bowl of an electric mixer fitted with the whisk attachment. Beat on high speed until thick, about 5 minutes. Reduce speed to low. Beat in remaining lime curd. Raise speed to high, and beat 3 minutes. Pour over lime curd in crust, spreading evenly with an offset spatula; gently shake to remove any air bubbles. Refrigerate, uncovered, overnight. Garnish with zest before serving.
