Lemon Mousse Shortbread Crumble (Printable Version)

Light, zesty lemon mousse layered over buttery shortbread crumble for a refreshing 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

→ Garnish

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

# Directions:

01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a bowl, combine flour, sugar, salt, and cold butter cubes. Rub together with fingertips or use a pastry cutter until mixture resembles coarse crumbs. Spread evenly on prepared baking sheet.
03 - Bake for 12 to 15 minutes, stirring halfway through, until golden brown. Cool completely before using.
04 - In a heatproof 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 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 continue beating until stiff peaks form.
06 - In a separate bowl, whip chilled heavy cream to soft peaks.
07 - Gently fold whipped cream into cooled lemon mixture. Fold in egg whites until just combined and smooth.
08 - Spoon generous layer of shortbread crumble into bottom of 6 small serving glasses or ramekins. Top with lemon mousse. Refrigerate for at least 2 hours before serving.
09 - Top each cup with fresh berries, lemon zest curls, and mint leaves if desired.

# Expert Tips:

01 -
  • It looks restaurant-worthy but won't keep you hovering over the stove, which means you can actually enjoy your guests instead of hiding in the kitchen.
  • The contrast between the crunchy shortbread and silky mousse somehow feels both light and deeply satisfying, like spring decided to become a dessert.
  • You can prep it hours ahead and just pull it from the fridge when you're ready, making it perfect for when your timing is messier than your good intentions.
02 -
  • Room temperature lemon custard is critical—if you fold hot or even warm custard into whipped whites, they'll deflate like a sad balloon, and you'll lose all that beautiful airiness.
  • Don't skip the double boiler step with the egg yolks; it's not just about thickening, it's about food safety, and rushing it with high heat will scramble your eggs into a curdled mess that no amount of folding can fix.
  • Assemble these no more than four hours before serving, because while the mousse is stable, it will eventually start to weep slightly as the ice crystals melt—they taste fine but look less pristine.
03 -
  • If your lemon juice tastes harsh or acidic, you likely have an older lemon—fresh lemons have a sweeter, rounder flavor that makes this mousse sing instead of pucker.
  • Separate your eggs when they're still cold from the fridge, because the yolks slip away from whites more cleanly, and then let the whites come to room temperature before whipping so they incorporate air more efficiently.
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