Lemon Mousse Shortbread Crumble (Printable)

Zesty lemon mousse combined with buttery shortbread crumble for a fresh, elegant springtime treat.

# 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

# Steps:

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 breadcrumbs. Spread evenly on the prepared baking sheet.
03 - Bake for 12 to 15 minutes, stirring halfway through cooking, until the crumble turns golden brown. Remove from oven and allow to cool completely.
04 - In a heatproof bowl, whisk together egg yolks, 1/4 cup sugar, lemon juice, and lemon zest. Set the bowl over a pot of simmering water, creating a double boiler. Whisk constantly for approximately 7 minutes until the mixture thickens. Remove from heat and cool to room temperature.
05 - In a clean, dry bowl, beat egg whites with cream of tartar until soft peaks form. Gradually add the remaining 1/4 cup sugar while 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. Fold in the beaten egg whites until just combined and smooth, being careful not to deflate the mixture.
08 - Divide the shortbread crumble evenly among 6 serving glasses or ramekins, creating a base layer. Top each with lemon mousse, filling to near the rim. Refrigerate for at least 2 hours before serving.
09 - Top each mousse cup with fresh berries, lemon zest curls, and mint leaves immediately before serving.

# Expert Advice:

01 -
  • It looks fancy enough to impress at dinner parties but comes together in under an hour of actual work.
  • The tartness of fresh lemon cuts through richness in a way that makes you want another spoonful immediately.
  • You can prep everything ahead and chill, which means you're actually relaxed when guests arrive.
02 -
  • If you skip the double boiler step and try to make the mousse without pasteurizing the eggs, you're taking a food safety risk—the heat matters, and so does whisking constantly so nothing scrambles.
  • Don't fold the whites in all at once; add them in two batches and fold gently, or you'll lose all that precious air and end up with a mousse that's dense instead of cloud-like.
03 -
  • Use a microplane zester for lemon zest and you'll get that fragrant, tender texture that looks restaurant-quality on top.
  • If you're nervous about raw eggs, pasteurizing them over a double boiler isn't just safer—it actually changes the texture of the mousse for the better, making it more luxurious.
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