Lemon Mousse Shortbread Cups (Print-Friendly)

Layers of light lemon mousse over buttery shortbread crumble create a refreshing spring dessert.

# 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

# Cooking 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 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 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 beat until stiff peaks form.
06 - In a separate bowl, whip chilled cream to soft peaks.
07 - Gently fold whipped cream into cooled lemon mixture. Then fold in egg whites until just combined and smooth.
08 - Spoon a generous layer of shortbread crumble into the bottom of 6 serving glasses or ramekins. Top with lemon mousse. Refrigerate for at least 2 hours.
09 - Top each cup with fresh berries, lemon zest curls, and mint leaves before serving.

# Expert Tips:

01 -
  • The mousse looks impressive enough to serve guests but takes less time than you'd expect, so you can actually enjoy your evening instead of being stuck in the kitchen.
  • That textural contrast between the buttery crumble and silky mousse is genuinely addictive, and the bright lemon flavor feels refreshing without being heavy.
  • It comes together in stages, meaning you can make the shortbread ahead and assemble everything last-minute if life gets chaotic.
02 -
  • The double boiler method isn't just for show—it gently cooks your egg yolks without scrambling them, which is the difference between silky mousse and grainy disappointment, so don't skip it or use direct heat.
  • Those cold ingredients and room-temperature bases matter because temperature affects how things fold and set, so read through the whole recipe before you start and let things come to temperature naturally rather than rushing.
  • If your mousse breaks or looks separated, you folded too aggressively or the base was too hot when you combined things—next time, let everything cool completely and use a gentle hand.
03 -
  • Toast some sliced almonds or pistachios in a dry pan for two minutes, let them cool, then chop them and mix them into your shortbread crumble for an unexpected crunch and flavor dimension that guests always ask about.
  • If the mousse breaks or looks lumpy when folding, don't panic—strain it through fine mesh, which smooths out the texture, and it'll still taste incredible even if it's not as voluminous.
  • Make lemon zest curls with a vegetable peeler rather than a microplane for the garnish—they look more elegant and give you something to grip when eating, which is the kind of detail that makes a dessert feel thoughtfully designed.
Go Back