Lemon Mousse Shortbread Cups (Printable)

Light lemon mousse layered with buttery shortbread crumble for a fresh, elegant spring dessert.

# What You'll Need:

→ 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

→ Garnish

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

# Directions:

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

# Expert Tips:

01 -
  • The shortbread crumble stays crispy under the mousse if you layer it just before serving, which feels like a small kitchen magic trick.
  • You're essentially making a show-stopping dessert with basic pantry ingredients and no special equipment beyond what you probably own.
  • It's the kind of dish that tastes like you spent hours in the kitchen when you really invested maybe thirty minutes of actual hands-on work.
02 -
  • If even a speck of egg yolk gets into your egg whites, start over—it's worth it because yolk contains fat, which prevents the whites from whipping properly.
  • The double boiler method for the lemon custard looks fancy but it's really just gentle heat; rushing it or using high heat will scramble your eggs and ruin everything.
  • Room-temperature lemon curd is essential before folding—if it's warm, it will melt the whipped cream and egg white structure you've worked to build.
03 -
  • Make sure your mixing bowls for the egg whites are completely grease-free; even a tiny smudge of butter or yolk will prevent them from whipping to full volume.
  • The tartness of fresh lemon juice varies slightly by season and variety, so taste your mousse as you build it and adjust the sweetness if needed.
  • Assemble these cups no more than a few hours before serving so the crumble stays crispy—if you must make them earlier, keep the crumble separate and layer just before eating.
Go back