What is Key Lime Tiramisu?

Key Lime Tiramisu is a no-bake dessert combining key lime pie’s citrusy tang with tiramisu’s creamy layers. It features rum-soaked ladyfingers and a mascarpone-based key lime custard.

How do you make the lime flavor pop?

Use fresh key lime juice and zest for maximum zing. If key limes are unavailable, regular limes work with extra zest to boost the tartness.

What ingredients are needed?

You need ladyfingers, mascarpone cheese, sweetened condensed milk, key lime juice, lime zest, heavy whipping cream, egg yolks, rum (or grape juice), sugar, and water.

How long does it keep?

It stays fresh in the fridge for three days, covered tightly. After that, ladyfingers soften too much.

Yes, it’s a no-bake layered dessert, requiring only chilling to set, perfect for hot summer days.

Can I use regular limes instead of Key limes?

Regular limes work, but they’re less tart. Add extra lime zest to match key lime flavor.

How long should it chill?

Chill for at least six hours, ideally overnight, to set the layers and meld flavors.

Are raw egg yolks safe?

Use pasteurized egg yolks to minimize risk. Fresh, properly stored yolks are generally safe.

What if I can’t find Key limes or firm ladyfingers?

Use regular limes with extra zest. For ladyfingers, check bakeries or try my homemade ladyfinger recipe .

Key Lime Tiramisu: How To Make This Refreshing Make-Ahead Dessert in 2025

Key Lime Tiramisu: How To Make This Refreshing Make-Ahead Dessert

Print Recipe

A refreshing no-bake Key Lime Tiramisu blending zesty key lime custard with creamy mascarpone and rum-soaked ladyfingers.

Author: lucy-chef
Prep Time: 20 minutes
Cook Time: 0 minutes
Total Time: 6 hours 20 minutes
Yield: 8 servings
Category: Dessert
Method: No-Bake
Cuisine: American
Diet: Vegetarian

Ingredients

Scale

14 oz sweetened condensed milk

1/2 cup key lime juice

2 tbsp lime zest

8 oz mascarpone cheese

1 cup heavy whipping cream

2 egg yolks

24 ladyfingers

1/4 cup rum (or grape juice)

1/2 cup sugar

1/2 cup water

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Instructions

1. Make lime-infused syrup: Boil water, sugar, and 1 tbsp lime zest. Cool, add rum.

2. Whisk egg yolks, condensed milk, and key lime juice until smooth.

3. Beat mascarpone and heavy cream until fluffy. Fold in key lime custard.

4. Dip ladyfingers in syrup quickly, arrange in a dish.

5. Spread custard mixture over ladyfingers, repeat layers.

6. Chill for 6 hours, garnish with lime zest.

Notes

Use pasteurized egg yolks for safety.

Substitute regular limes if key limes are unavailable.

Find it online: https://www.snazzyrecipes.com/key-lime-tiramisu-make-ahead-dessert/