Preheat the oven to 200C/400F/Gas 6.
For the frittata, divide the butter betwee two, small blini pans.
Place the eggs, cream, sugar, biscuits and blackberries into a bowl and mix together.
Divide the mixture between the blini pans and transfer to the oven for 10 minutes.
For the chocolate sauce, melt the butter in a pan over a medium heat and add the sugar and cocoa, and stir until the sugar has dissloved.
Add the golden syrup and double cream and cook , until the sauce thickens.
Serve the frittatas in their pans and spoon over some of the chocolate sauce.