Clean, hull, and slice the strawberries.
In a blender or food processor, combine strawberries and sugar. Puree until smooth.
Reserve ½ cup of the strawberry puree and set aside.
In a cold mixing bowl, whip the cream using a hand or stand mixer until stiff peaks form.
Gently fold the remaining strawberry puree into the whipped cream until well combined.
Divide the reserved strawberry puree evenly among 4 dessert glasses to create a base layer.
Top with the strawberry mousse mixture, filling each glass.
Refrigerate for at least 1 hour, or overnight for best texture.
Before serving, garnish with fresh strawberry slices or mint if desired.