Heat oven to 200°C (180°C fan).
Line a Swiss roll tin or shallow baking tray (about 23cm x 33cm) with baking paper.
Whisk the eggs and caster sugar together until very thick, pale, and tripled in volume. Fold in the flour gently, followed by the vanilla if using.
Bake for 10–12 minutes until golden and springy to the touch.
Lay a clean tea towel on the worktop and dust generously with icing sugar. Turn the sponge out onto the towel and carefully peel off the baking paper
Starting from a short end, roll the sponge up with the towel inside. Leave to cool completely
Whisk the double cream and icing sugar until it forms soft peaks and mix in your diced strawberries. Ensuring you drain the juice
Unroll the cooled sponge carefully and spread over the whipped cream and strawberries mix
Roll up again gently, without the towel
Dust with icing sugar and slice. Or if your'e bougie, pipe some cream on top and add decoration