Lemon Mousse Shortbread Crumble (Print Version)

Light lemon mousse paired with buttery shortbread crumble creates a refreshing, 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 - Mint leaves

# How to Make It:

01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine flour, sugar, salt, and cold cubed butter. Rub together with your fingertips or use a pastry cutter until the mixture resembles coarse breadcrumbs. Spread evenly across the prepared baking sheet.
03 - Bake for 12 to 15 minutes, stirring halfway through, until golden brown. Remove from oven and allow to cool completely on the baking sheet.
04 - In a 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 for approximately 7 minutes until the mixture thickens. Remove from heat and cool to room temperature.
05 - In a clean bowl, beat egg whites with cream of tartar using an electric mixer until soft peaks form. Gradually add the remaining 1/4 cup sugar and continue beating until stiff peaks form.
06 - In a separate chilled bowl, whip the heavy cream to soft peaks using an electric mixer.
07 - Gently fold the whipped cream into the cooled lemon mixture using a rubber spatula. Then carefully fold in the egg white meringue until just combined and smooth.
08 - Spoon a generous layer of cooled shortbread crumble into the bottom of 6 small serving glasses or ramekins. Top each with lemon mousse, dividing evenly among the vessels. Refrigerate for at least 2 hours.
09 - Remove from refrigeration and garnish each cup with fresh berries, lemon zest curls, and mint leaves as desired before serving.

# Expert Advice:

01 -
  • The contrast between crispy shortbread and silky mousse feels restaurant-quality but comes together in your own kitchen without fuss.
  • Lemon brightens everything it touches, and this dessert tastes like sunshine without ever being cloying or overly sweet.
  • You can make these hours ahead, which means less stress when guests arrive and more time to actually enjoy their company.
02 -
  • Raw or undercooked eggs can be a food safety concern, so that gentle heating to 160°F isn't optional—it pasteurizes the yolks and makes this safe to eat.
  • Folding is an art, not a science; rushing this step and stirring instead of folding will deflate your mousse and leave you with a dense dessert instead of the ethereal one you're after.
  • Make sure your cream and egg whites are as cold as possible before whipping—this helps them hold their structure longer and gives you more stable peaks.
03 -
  • Toast your shortbread crumble on the lower oven rack if your oven browns things too quickly on top—this gives you more control over achieving that perfect golden color.
  • If your lemon mixture breaks or looks grainy when you're cooking it over the double boiler, strain it through a fine sieve before cooling to bring back smoothness.
  • Chill your mixing bowls in the freezer for 15 minutes before whipping cream or egg whites—even a few degrees colder makes a noticeable difference in how quickly they whip and how stable they become.
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