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Plated slice showing creamy layers and lime garnish.
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Key Lime Tiramisu

Key Lime Tiramisu made with lime-soaked ladyfingers and a smooth mascarpone cream. This no-bake dessert is easy to make ahead and perfect for serving a crowd. 
Course Dessert
Cuisine American
Keyword key lime
Prep Time 25 minutes
Chill Time 6 hours
Total Time 6 hours 25 minutes
Servings 18 people
Calories 524kcal
Author Jillian Wade
Cost $37.42

Equipment

  • mixing bowls
  • hand mixer or stand mixer
  • measuring cups and spoons
  • Microplane or zester
  • Citrus juicer
  • small saucepan
  • whisk
  • rubber spatula
  • 8x8-inch or 9x9-inch baking dish
  • Offset spatula or spoon for spreading
  • Knife and cutting board

Ingredients

Lime Syrup

  • 1 ½ cups water
  • ¾ cup granulated sugar
  • ¾ cup fresh key lime juice or regular lime juice
  • 1 ½ teaspoons lime zest

Key Lime Mascarpone Cream

  • 24 oz mascarpone cheese cold
  • 12 oz cream cheese softened
  • 1 ½ cups powdered sugar
  • 3 Tablespoons key lime juice
  • 1 ½ Tablespoons key lime zest
  • 1 ½ teaspoons vanilla extract
  • Pinch of salt
  • 2 ¼ cups heavy whipping cream cold

Assembly

  • About 50 crispy ladyfingers about 2 packages
  • Extra lime zest for garnish

Optional Toppings

US Customary - Metric

Instructions

Make the Lime Syrup

  • Combine the water, sugar, lime juice, and zest in a small saucepan.
    1 ½ cups water, ¾ cup granulated sugar, ¾ cup fresh key lime juice, 1 ½ teaspoons lime zest
  • Warm over medium heat just until the sugar dissolves.
  • Remove from heat and cool completely.

Make the Key Lime Cream

  • Beat the mascarpone and cream cheese until completely smooth.
    24 oz mascarpone cheese, 12 oz cream cheese
  • Add the powdered sugar, lime juice, zest, vanilla, and salt. Mix until creamy and fully combined.
    1 ½ cups powdered sugar, 3 Tablespoons key lime juice, 1 ½ Tablespoons key lime zest, 1 ½ teaspoons vanilla extract, Pinch of salt
  • In a separate bowl, whip the heavy cream to stiff peaks.
    2 ¼ cups heavy whipping cream
  • Gently fold the whipped cream into the mascarpone mixture until light and smooth.

Assemble the Tiramisu

  • Briefly dip each ladyfinger into the cooled lime syrup for 1 second. Do not soak.
    About 50 crispy ladyfingers
  • Arrange a full layer of dipped ladyfingers in the bottom of a 9x13-inch dish. (You’ll need to pack them in tightly for full coverage.)
  • Spread half of the key lime cream mixture evenly over the ladyfingers.
  • Repeat with a second layer of dipped ladyfingers, then spread the remaining cream on top.
  • Smooth the top with a spatula.

Chill

  • Cover and chill in the refrigerator for 4 to 6 hours, or overnight, until fully set.

Garnish and Serve

  • Top with whipped cream, lime zest, and optional lime slices or white chocolate shavings just before serving.
    Extra lime zest, Whipped cream, Thin lime slices, White chocolate shavings
  • Serve or chill until ready to serve.

Notes

  • Store in the refrigerator, covered, for up to 3 days. Add whipped cream, lime slices, and white chocolate just before serving.
  • To freeze, wrap the dish tightly without fresh garnish and freeze for up to 1 month. Thaw overnight in the refrigerator. The texture will be softer after freezing, but it will still be delicious.
  • This recipe is great for making ahead. Assemble it the night before, chill overnight, then garnish before serving.

Nutrition

Serving: 1slice | Calories: 524kcal | Carbohydrates: 40g | Protein: 8g | Fat: 37g | Saturated Fat: 22g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 6g | Cholesterol: 158mg | Sodium: 135mg | Potassium: 104mg | Fiber: 0.4g | Sugar: 20g | Vitamin A: 1397IU | Vitamin C: 4mg | Calcium: 108mg | Iron: 1mg