Begin by chilling a large bowl and the beaters for the electric mixer. Ensure your heavy cream is well chilled.

Add one tablespoon of water to a microwave safe cup or bowl and sprinkle unflavored gelatin over the top of the water. Set aside for 3-4 minutes until the gelatin mixture thickens.

Microwave the gelatin water until the gelatin is fully dissolved, about 5 seconds. Stir and set aside to cool. Add 1 tablespoon of the heavy cream to the warm gelatin mixture to cool it.

In the chilled mixing bowl, add the cold heavy cream and whip on medium-high speed until soft peaks form. Slowly stream in the cooled gelatin mixture as you continue mixing the whipped cream until stiff peaks form.

Add the lemon curd to the whipped cream mixture and whip at low speed, using a rubber spatula to scrape the bottom of the bowl to ensure the mousse is fully mixed. Taste the mousse and add a tablespoon more lemon curd, if you need a stronger citrus flavor.