Blackberry meringue cake

Cake

• 200 g unsalted butter, softened, plus extra for greasing
• 300 g caster sugar
• 50 g blanched almonds
• 4 eggs ; 2 whole and 2 separated
• 200 g self-raising flour
• 100 g milk
• 150 g frozen blackberries, defrosted
• 1 pinch cream of tartar
• 2 tbsp flaked almonds

Filling

• 300 g pouring (whipping) cream
• 4 tbsp blackberry jam
• 100 g frozen blackberries, defrosted
• pure icing sugar, for decorating (optional)