Victoria Sponge

Sponge

• 170 g unsalted butter, diced, plus extra for greasing
  or margarine, plus extra for greasing
• 170 g caster sugar
• 3 medium eggs
• 170 g self-raising flour
• 1 tsp baking powder
• 1 tsp bicarbonate of soda
• 1 tsp natural vanilla extract (optional)

Filling

• 100 g jam (e.g. strawberry and raspberry)
• 200 g double cream
• 150 g raspberries
• 1 Tbsp icing sugar, for dusting