Beat eggs for 4-5 minutes.

Gradually add the sugar until mixture is thick and creamy.

Sieve the flour, cocoa and baking powder.

Fold into the mixture.

Pour onto lined flat baking tray.

Bake 6-8 minute at 200C

Turn cake out onto a sugared tea towel, trim edges and roll up. When cool, unroll gently and spread jam and then whipped cream filling and roll up again firmly.