Mixed-Berry Tiramisù with Lime Curd

How to make Lime Curd

4 limes at room temperature
1 1/2 cups sugar
1/4 pound unsalted butter at room temperature
4 extra-large eggs at room temperature
1/8 teaspoon salt

Remove the zest of 4 limes with a vegetable peeler or zester, being careful to avoid the white pith. Squeeze the limes to make 1/2 cup of juice and set the juice aside. Put the zest in a food processor fitted with a steel blade. Add the sugar and process for 2 to 3 minutes, until the zest is very finely minced.

In the bowl of an electric mixer fitted with a paddle attachment, cream the butter with the sugar and lime zest. Add-- the eggs, 1 at a time, and then add the lime juice and salt. Mix until combined. Pour the mixture into a 2-quart saucepan and cook over low heat, stirring constantly, until thickened, about 10 minutes. The lime curd will thicken at about 175 degrees F, or just below a simmer. Remove from the heat and set aside.

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Mixed-Berry Tiramisù with Lime Curd
This luxurious treat is somewhere between a trifle, a tiramisù, and a summer pudding. The lime gives it a wonderful brightness.
Ingredients
Berries:
3 cups fresh blueberries (17 ounces)
1 cup fresh raspberries (41/2 to 5 ounces)
1 cup fresh blackberries (5 to 6 ounces)
1 cup powdered sugar
1/2 cup water
3 tablespoons fresh lime juice
1 cup thinly sliced fresh strawberries

Syrup and ladyfinger layer:
1/3 cup water
1/3 cup sugar
3 1 1/2-inch-long strips lime peel (green part only; shaved with vegetable peeler)
1 7-ounce package crisp ladyfingers (savoiardi, Boudoirs, or Champagne biscuits; do not use soft ladyfingers)*
Mascarpone topping:
2 1/2 8-ounce containers mascarpone cheese**
1/2 cup chilled heavy whipping cream
Lime Curd

PreparationFor berries:
Combine blueberries, raspberries, blackberries, powdered sugar, and 1/2 cup water in large saucepan. Bring to simmer, stirring until sugar dissolves. Reduce heat to medium and simmer until berries are soft but still intact, stirring occasionally, about 8 minutes. Transfer mixture to large bowl; stir in lime juice. Cool to room temperature. Stir strawberries into berry mixture. Chill until cold, about 4 hours. DO AHEAD: Can be made 1 day ahead. Cover and keep chilled.

For syrup and ladyfinger layer:

Combine 1/3 cup water, 1/3 cup sugar, and lime peel strips in small saucepan. Bring to boil over medium heat, stirring until sugar dissolves. Pour syrup into bowl. Cool to room temperature; discard lime peel. Using pastry brush, brush ladyfingers on both sides with syrup. Arrange in single layer in 13x9x2-inch glass baking dish, cutting to fit and covering bottom of dish completely. Pour chilled berry mixture over.

For mascarpone topping:
Combine mascarpone and cream in large bowl. Using electric mixer, beat until smooth and slightly thickened (do not overbeat or mixture may curdle). Add Lime Curd; beat just until blended. Drop mascarpone topping by large spoonfuls over berry mixture. Spread evenly, covering berries completely. Cover and chill at east 8 hours. DO AHEAD: Can be made 1 day ahead. Keep chilled. Spoon tiramisù into bowls and serve.
* Available at some supermarkets and at specialty foods stores and Italian markets.
** An Italian cream cheese; sold at many supermarkets and at Italian markets

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Lime Curd Tart

Ingredients
Tart Shell:
3/4 cup unsalted butter at room temperature
1/2 cup sugar
1/2 teaspoon pure vanilla extract
1 3/4 cups all-purpose flour
Pinch salt
Filling:
4 limes at room temperature
1 1/2 cups sugar
1/4 pound unsalted butter at room temperature
4 extra-large eggs at room temperature
1/8 teaspoon salt
Directions
Preheat the oven to 350 degrees F.

In the bowl of an electric mixer fitted with a paddle attachment, mix the butter and sugar together until they are just combined. Add the vanilla. In a medium bowl, sift together the flour and salt, then add them to the butter-and-sugar mixture. Mix on low speed until the dough starts to come together. Dump onto a surface dusted with flour and shape into a flat disk. Press the dough into a 10-inch-round or 9-inch-square false-bottom tart pan,

making sure that the finished edge is flat. Chill until firm. Butter 1 side of a square of aluminum foil to fit inside the tart and place it, buttered side down, on the pastry. Fill with beans or rice. Bake for 20 minutes. Remove the foil and beans, prick the tart all over with the tines of a fork, and bake again for 20 to 25 minutes more, or until lightly browned. Allow to cool to room temperature. Remove the zest of 4 limes with a vegetable peeler or zester, being careful to avoid the white pith. Squeeze the limes to make 1/2 cup of juice and set the juice aside. Put the zest in a food processor fitted with a steel blade. Add the sugar and process for 2 to 3 minutes, until the zest is very finely minced. In the bowl of an electric mixer fitted with a paddle attachment, cream

the butter with the sugar and lime zest. Add-- the eggs, 1 at a time, and then add the lime juice and salt. Mix until combined. Pour the mixture into a 2-quart saucepan and cook over low heat, stirring constantly, until thickened, about 10 minutes. The lime curd will thicken at about 175 degrees F, or just below a simmer. Remove from the heat and set aside. Fill the tart shell with warm lime curd and allow to set at room temperature. Once set, serve immediately or refrigerate until eady to serve.