Pure the strawberries until smooth in a blender or food processor. If preferred, pass the purée through a fine strainer to separate seeds.
Spoon the strawberry puree into a medium bowl then whisk in the lemon juice, vanilla extract, and erythritol. Stir until completely mixed.
Whisk the heavy whipping cream and a little of salt in a large bowl until firm peaks form.
Fold the strawberry mixture gently into the whipped cream until smooth and totally blended.
Spoon the mousse into serving cups; chill for at least one hour to solidify.
6. Optionally decorate before serving with mint sprig and fresh strawberry slices.
Variations and advice
Replace the strawberries for a distinct taste sensation with blueberries or raspberries. Fold in more finely chopped nuts or unsweetened coconut flakes if you would like some extra texture. To create a thicker, cheesecake-like consistency for a more luxurious mousse, gently stir melted cream cheese into the strawberry mixture then fold it into the whipped cream.
