Mary's Chocolate Roulade (no flour, Great British Bake Off recipe)

dark chocolate (39% cocoa solids, finely chopped)

large free-range eggs (at room temperature)

caster sugar

cocoa powder

pourable double cream

Icing sugar (for dusting)

x 23cm x 33cm non-stick baking tray

Greaseproof paper

Butter for greasing