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Key Lime Tiramisu

A tropical twist on tiramisu with rum soaked lady fingers and a creamy mascarpone and tart key lime filling- chilled to perfection .
5 from 3 votes
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Course: Sweet Tooth
Cuisine: American
Keyword: key lime tiramisu
Prep Time: 1 hour 45 minutes
resting time: 4 hours
Total Time: 5 hours 45 minutes
Servings: 9
Calories: 523kcal
Author: Meggen Wilson

Ingredients

Key Lime custard

  • 1 cup Key Lime Juice
  • 14 oz sweetened condensed milk
  • 2 large egg yolks use pasteurized eggs

Whipped Cream layer

  • 8 oz heavy whipping cream cold
  • 8 oz mascarpone cheese softened- room temperature
  • ¼ cup sugar
  • 1 cup water
  • 1 tsp lime zest
  • 3 TBSP light rum
  • 14 oz lady fingers cookies - crisp style 2- 7oz packages

Whipped cream topping

  • 6 oz heavy whipping cream whipped
  • 1 TBSP Sugar Vanilla Sugar works beautifully with this recipe

Garnish

  • 1 TBSP Confectioner's sugar sifted
  • 1 TBSP lime zest
  • 2 TBSP Lady finger crumbs

Instructions

Making the Key Lime Filling and Mascarpone Cream :

  • In a medium bowl, combine the key lime juice, sweetened condensed milk and pasteurized eggs yolks. Cover and chill for 1 hour until thick and firm.
  • In the bowl of a stand mixer, whip 1 cup of heavy cream until soft peaks form, about 3-4 minutes. Whisk in the mascarpone until light and well combined. Cover and chill.

Make the Lime Infused Simple Syrup:

  • In a small saucepan, bring to a simmer the 1 cup of water, 1 TBSP of sugar, and 1 tsp of lime zest.
    Stir on a low simmer until the sugar is dissolved. This will take about 2-3 minutes. Do not let the mixture boil.
    Turn off the heat and pour in the rum. Pour the lime infused simple syrup into a shallow dish. Let cool.

For the Whipped Cream Topping

  • Whip remaining 6 oz of heavy cream and add 1 TBSP of sugar until sugar dissolves. Keep chilled until time to assemble the tiramisu.

To Assemble:

  • Take each lady finger cookie and gently dip them one by one into the lime infused simple syrup for just a moment. Place in the bottom of an 8 inch x 8inch dish. You may need to break a few of the cookies to make them fit in a single layer. Reserve one lady finger for the topping.
  • Using an offset spatula, spread the mascarpone cream mixture over the top of the rum-simple syrup soaked lady fingers.
  • Add another layer of rum soaked -simple syrup dipped lady finger cookies on top of the mascarpone cream. Top with the Key Lime filling.
  • For the topping, spoon the chilled sweetened whipped cream over the top.
  • Cover and chill at least 4 hours or overnight.

To Serve:

  • To Serve: Dust with powdered sugar and sprinkle with lime zest and reserved cookie crumbs. To serve, cut into squares and top each slice with a thinly sliced lime wedge.

Nutrition

Calories: 523kcal | Carbohydrates: 47.7g | Protein: 8.3g | Fat: 20.7g | Saturated Fat: 2g | Cholesterol: 144.2mg | Sodium: 115.8mg | Sugar: 34.7g