Lemon mousse with shortbread (Printable version)

Light lemon mousse layered over buttery shortbread crumble offers a zesty, elegant spring treat.

# Ingredient List:

→ Shortbread Crumble

01 - 1 cup all-purpose flour
02 - 1/4 cup granulated sugar
03 - 1/2 cup unsalted butter, cold and cubed
04 - Pinch of salt

→ Lemon Mousse

05 - 3 large eggs, separated
06 - 1/2 cup granulated sugar
07 - 1/3 cup freshly squeezed lemon juice
08 - 2 teaspoons finely grated lemon zest
09 - 1/2 cup heavy cream, chilled
10 - 1/4 teaspoon cream of tartar, optional

→ Garnish

11 - Fresh berries
12 - Lemon zest curls
13 - Mint leaves

# How-To Steps:

01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a bowl, combine flour, sugar, salt, and cold butter. Rub together with fingertips or use a pastry cutter until mixture resembles coarse crumbs. Spread evenly on the prepared baking sheet.
03 - Bake for 12 to 15 minutes, stirring halfway through, until golden brown. Remove from oven and cool completely.
04 - In a medium heatproof bowl, whisk together egg yolks, 1/4 cup sugar, lemon juice, and lemon zest. Place the bowl over a pot of simmering water and whisk constantly until thickened, approximately 7 minutes. Remove from heat and cool to room temperature.
05 - In a clean bowl, beat egg whites with cream of tartar until soft peaks form. Gradually add remaining 1/4 cup sugar and beat until stiff peaks form.
06 - In a separate bowl, whip the chilled cream to soft peaks.
07 - Gently fold the whipped cream into the cooled lemon mixture. Then fold in the egg whites until just combined and smooth.
08 - Spoon a generous layer of shortbread crumble into the bottom of 6 small serving glasses or ramekins. Top with lemon mousse.
09 - Chill for at least 2 hours before serving. Garnish each cup with berries, lemon zest curls, and mint if desired.

# Expert Advice:

01 -
  • It tastes like restaurant-quality dessert but comes together faster than you'd expect, which means you can actually enjoy your guests instead of being stuck in the kitchen.
  • The contrast between the buttery crumble and airy mousse gives you multiple textures in every spoonful, making it feel far more complex than it actually is.
  • Lemon is bright enough to feel refreshing after any meal, especially when you're craving something that doesn't leave you feeling heavy.
02 -
  • Egg yolk temperature matters enormously—if your curd gets too hot too fast, it scrambles into bits instead of becoming silky, so low heat and constant whisking is the only way to win this part.
  • Fold, don't stir—this is where so many people accidentally deflate their mousse by being too aggressive, and suddenly you're eating a pudding instead of a cloud.
  • Make sure your cream is actually cold before whipping it, because warm cream never achieves the same volume and texture, leaving you with something closer to yogurt.
03 -
  • Make the crumble a few hours ahead so it's completely cool and crispy before assembly—warm crumble releases moisture that softens everything below it.
  • If you don't have cream of tartar, a tiny pinch of lemon juice added to the egg whites right before beating serves the same stabilizing purpose.
  • Toasted chopped almonds or pistachios mixed into the crumble add a textural surprise that makes people wonder what that subtle flavor is underneath the butter and lemon.
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