Easy Lemon Mousse

Ingredients

• 150 ml Fresh lemon juice (About 3 medium lemons, juiced)
• 100 g Granulated sugar
• 15 g Cornstarch (Maïzena) (About 2 tablespoons)
• 2 Egg yolks (Fresh eggs, preferably pasteurized)
• 200 g Mascarpone (At room temperature)
• 50 g Powdered sugar
• 1 c. à café Vanilla extract (Optional, to round the flavor)
• 200 ml Heavy whipping cream (Cold, at least 30 % fat minimum)
• 4 leaves Fresh mint leaves (For decoration)

Instructions

1. Prepare the lemon syrup

   Juice the lemons to obtain 150 ml of juice. Pour the juice into a saucepan, add the granulated sugar and the cornstarch. Mix with a whisk off the heat until a homogeneous mixture is obtained.

   Time: PT5M

2. Cook the mixture

   Place the saucepan over medium‑low heat. Stir constantly with the whisk for about 10 minutes, until the mixture thickens and becomes as smooth as a béchamel.

   Time: PT10M

   Temperature: Moyen-doux

3. Incorporate the egg yolks

   Remove the saucepan from the heat. Add the two egg yolks in a stream while whisking vigorously to avoid cooking the eggs.

   Time: PT2M

4. Cool the lemon cream

   Transfer the preparation to a bowl, cover with plastic film in contact with the surface to prevent a skin from forming. Let cool at room temperature then place in the refrigerator for at least 30 minutes.

   Time: PT30M

5. Whip the cream

   In a cold bowl, pour the heavy cream, add the powdered sugar and the vanilla extract. Whisk on medium‑high speed until a firm whipped cream is obtained (about 2 minutes).

   Time: PT5M

6. Mix mascarpone and lemon cream

   In a large bowl, incorporate the softened mascarpone. Add the cooled lemon cream and gently mix with a spatula until a homogeneous paste is obtained.

   Time: PT3M

7. Fold in the whipped cream

   Add the whipped cream in two batches, lifting the mass with the spatula (folding technique) so as not to deflate it.

   Time: PT2M

8. Plating

   Pour the mousse into verrines or small glasses. Smooth the surface with the back of a spoon. Decorate each portion with a mint leaf and, if desired, a lemon zest.

   Time: PT5M

9. Chill

   Cover the verrines with plastic film and place in the refrigerator for at least 4 hours (or overnight) before serving.

   Time: PT4H

Nutrition Facts

Calories

250

Protein

4 g

Carbohydrates

30 g

Fat

12 g

Fiber

0 g

Ingredient Substitutions

• Instead of Fresh lemon juice: bottled lemon juice (unsweetened)
• Instead of Granulated sugar: cane sugar, coconut sugar
• Instead of Cornstarch (Maïzena): arrow-root, rice flour
• Instead of Egg yolks: ready-made pastry cream
• Instead of Mascarpone: 0% fat cream cheese (lighter), ricotta
• Instead of Powdered sugar: sifted granulated sugar
• Instead of Vanilla extract: vanilla bean, lemon zest
• Instead of Heavy whipping cream: whipping cream, coconut cream (for lactose‑free version)
• Instead of Fresh mint leaves: lemon zest, basil

Equipment Needed

• Medium saucepan
• Hand whisk
• Large mixing bowl
• Immersion blender or electric mixer
• Silicone spatula
• Liquid measure (measuring cup)
• Measuring spoons
• Verrines or small serving glasses
• Plastic film
• Zester or fine grater (optional)

Critical Steps — Do Not Skip

• Mixing lemon juice, sugar and starch off the heat (prevents lumps).
• Cooking over medium‑low heat without boiling (preserves texture).
• Incorporating egg yolks off the heat (prevents curdling).
• Complete cooling before adding mascarpone (prevents separation).
• Gentle folding of the whipped cream (maintains aeration).

Chef Tips from the Video

• Zest the lemon before juicing to capture maximum aroma.
• For a touch of color, add a few drops of pale yellow food coloring to the mousse.
• A light drizzle of honey on each verrine before serving adds a subtle sweet note.

Troubleshooting

Storage

Refrigerator: Up to 3 days in an airtight container.

Freezer: Not recommended, texture degrades.

Room temperature: Do not leave at room temperature more than 2 hours.

Make-Ahead Tips

• Prepare the lemon base the day before and keep refrigerated, then add the whipped cream on the day of serving.
• Verrines can be plated ahead and simply covered with plastic film.