Lemon Mousse Shortbread Crumble (Printable Version)

Zesty lemon mousse layered over buttery shortbread crumble for a light and refreshing spring treat.

# 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

# Steps:

01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine flour, sugar, and salt. Add cold cubed butter and rub together with fingertips or pastry cutter until mixture resembles coarse crumbs. Spread evenly on prepared baking sheet.
03 - Bake for 12-15 minutes, stirring halfway through, until golden brown. Remove from oven and cool completely.
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 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 until combined. Then fold in beaten egg whites until just combined and smooth throughout.
08 - Spoon a generous layer of shortbread crumble into the bottom of 6 small serving glasses or ramekins. Top each with lemon mousse, dividing evenly.
09 - Refrigerate for at least 2 hours. Garnish each cup with fresh berries, lemon zest curls, and mint leaves before serving.

# Expert Advice:

01 -
  • The contrast between crispy, buttery crumble and silky lemon mousse creates texture magic in every spoonful.
  • It comes together in under an hour of hands-on time, with most of the waiting happening while you do other things.
  • Light enough for spring but fancy enough to impress people without feeling like you spent hours in the kitchen.
02 -
  • Separate your eggs very carefully—even a speck of yolk in the whites will prevent them from whipping into peaks, so it's worth taking a moment to do this properly.
  • The double boiler step pasteurizes the eggs, which is why we heat them to 160°F rather than skipping this entirely, so don't shortcut it if you're concerned about food safety.
  • Folding is your friend here—aggressive mixing deflates all the air you worked to create, so use gentle strokes and stop as soon as you don't see streaks of white.
03 -
  • If you're making these ahead, assemble everything but the mousse the morning of, and fold the mousse together about 2 hours before serving so it's perfectly chilled and set.
  • A microplane zester will change your relationship with citrus—the zest is so fragrant and fine that it distributes evenly rather than in tough little bits.
  • Keep your bowl and beaters in the freezer for 5 minutes before whipping cream to guarantee maximum volume in minimum time.
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