Preheat the oven to 180°C and line a baking tray with baking paper.
In a stand mixer, beat the egg whites with a pinch of salt until stiff peaks form.
Add 100 g of sugar and 1 tbsp vanilla essence, and whisk until the mixture becomes glossy.
Add the egg yolks and mix briefly until incorporated.
Add the flour all at once and mix for 10–15 seconds until combined.
Spread the batter evenly onto the prepared baking tray.
Bake for 12–15 minutes, until the sponge is lightly golden. Do not overbake.
Remove from the oven and immediately roll the sponge lengthwise with the baking paper still attached. Let it rest for 30 minutes.
Meanwhile, prepare the whipped cream by mixing the double cream with the remaining sugar and vanilla essence until stiff peaks form.
After the sponge has cooled, gently unroll it.
Spread a layer of strawberry jam over the sponge, followed by a layer of whipped cream.
Roll the sponge again to form the roulade.
Refrigerate for a few hours before slicing and serving.