Victoria sponge cake

Sponge

• 170 g unsalted butter cut into pieces, plus extra to grease
• 170 g caster sugar
• 3 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 (strawberry or raspberry - see Tip)
• 200 g pouring (whipping) cream
• 125 g fresh raspberries
• 1 tbsp icing sugar to dust