Lemon Mousse Cups Shortbread (Printable)

A light lemon mousse with buttery shortbread crumble and fresh berry garnish.

# 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 Steps:

01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a bowl, combine flour, sugar, salt, and cold butter. Rub together with fingertips or use a pastry cutter until mixture resembles coarse crumbs. Spread 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 until thickened, approximately 7 minutes. 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 beat until stiff peaks form.
06 - In a separate bowl, whip the chilled 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. Chill for at least 2 hours before serving.
09 - Top each cup with fresh berries, lemon zest curls, and mint leaves if desired.

# Expert Advice:

01 -
  • The contrast between crispy shortbread and silky mousse is genuinely addictive—your guests will ask for the recipe.
  • It's naturally elegant without requiring any fancy techniques or special equipment you don't already have.
  • Lemon mousse stays light and refreshing even when you're full, making it the perfect finale to a heavy meal.
02 -
  • Separate your eggs when they're cold, and make sure no egg yolk gets into the whites—even a speck of yolk prevents them from whipping properly.
  • The double boiler step isn't just for cooking; it gently pasteurizes the eggs while thickening them, making the mousse both safe and silky.
  • Don't skip the cooling step for the lemon mixture; folding it while warm will deflate your carefully whipped egg whites.
03 -
  • Use a microplane zester for the lemon zest—it creates those elegant, paper-thin curls that look restaurant-quality and actually taste brighter than larger pieces.
  • If you're worried about the raw eggs in the mousse, the double boiler method brings them to a safe temperature without scrambling them; this is the secret to silky custard.
Return