Bring to a boil, then turn off the heat and stir until the sugar has dissolved.
Set aside to cool.
Prepare the Strawberry Purée:
Add the strawberries to a blender and blend until smooth.
Pass the purée through a fine sieve into a medium mixing bowl to remove seeds.
Stir the cooled sugar syrup into the strawberry purée.
Whip the Cream:
In a chilled large mixing bowl, pour in the cream.
Using an electric whisk, whip until semi-firm peaks form (see recipe notes)
Fold and Portion:
Gently fold the strawberry purée into the whipped cream until fully combined.
Immediately spoon or pipe the mousse into ramekins.
Chill and Serve:
Cover and refrigerate for at least 2 hours before serving.
Notes
Checking Semi-Firm Peaks: When properly whipped, the cream should hold its shape but the peak will gently fold over at the top rather than standing straight upright.Avoid Over-Whipping: Stop as soon as the cream reaches the semi-firm stage. Over-whipping can cause the texture to become grainy and flat.Whip in Stages: Start whipping at medium speed. Once the cream starts to thicken, increase the speed and stop as soon as it reaches the desired consistency.Choose the Right Cream: Use high-quality whipping cream with a minimum of 30% fat. Anything lower may not whip properly.Strawberries: Use ripe, sweet strawberries for the best flavor.Cold Cream: Cold cream whips better. Keep it in the fridge until you’re ready.