Pre-heat oven to 180°C / gas 4.
Grease and line an ANTA baking dish.
Put the chocolate and butter into a heatproof mixing bowl, set over a pan of barely simmering water and allow to melt slowly, stirring occasionally.
Once the butter and chocolate have melted, remove from the heat and allow to cool for 1 – 2 minutes.
Beat the eggs and sugar together with an electric whisk before folding in the flour and raspberries.
Gently pour the mixture into the ANTA baking dish and bake for 30 – 35 minutes or until golden brown.
To check, insert a scewer into the centre and if it comes out clean it’s ready (the raspberries may leave a residue on the skewer so don’t be fooled by their juiciness!).
Remove the sponge from the oven and allow to cool for 10 minutes before turning out onto a wire rack.
Place the extra chocolate into a heatproof bowl and set over a pan of barely simmering water.
Stir until the chocolate has melted and is smooth.
Drizzle over the cake before serving.