Lemon mousse shortbread crumble (Print Version)

Zesty lemon mousse paired with buttery shortbread crumble for a light, elegant dessert.

# What You 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 the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine flour, sugar, salt, and cold butter cubes. Rub the mixture together with your fingertips or use a pastry cutter until it resembles coarse crumbs. Spread the mixture 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 for approximately 7 minutes until thickened. 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 the remaining 1/4 cup sugar and continue beating until stiff peaks form.
06 - In a separate bowl, whip the chilled heavy 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 - Refrigerate for at least 2 hours before serving. Garnish each cup with fresh berries, lemon zest curls, and mint leaves if desired.

# Expert Advice:

01 -
  • The mousse is cloud-like and refreshing, with a bright lemon punch that feels indulgent but won't leave you feeling stuffed.
  • You can make both components ahead, which means less stress when guests arrive and more time to enjoy their company.
  • That buttery shortbread crumble adds the perfect textural contrast and honestly tastes like a shortbread cookie at the bottom of your spoon.
02 -
  • The double boiler method for the custard is non-negotiable if you're using raw eggs—direct heat will scramble them, and you need that creamy texture to be silky, not chunky.
  • Separating eggs is easier when they're cold, but egg whites whip to higher, more stable peaks when they're at room temperature, so separate them first and let them sit while you prepare the other components.
  • Folding is everything—rushing this step and stirring aggressively will deflate all your whipped cream and egg whites, making the mousse dense instead of cloud-like.
03 -
  • The mousse develops better flavor if you make it a few hours ahead rather than right before serving—the lemon intensity deepens as it sits, and the texture becomes more stable.
  • If your kitchen is warm, work quickly when folding the components together and keep everything cold until the last possible moment, or your mousse may become thin instead of staying mousse-like.
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