Sour-Cream Chocolate Cake

INGREDIENTS

2/3 cup

sour cream or crème frâiche

eggs

1 1/2 tsp

vanilla extract or vanilla bean paste

1 1/3 cups

plain flour

1/3 cup

best quality cocoa

1 cup

caster sugar (superfine sugar)

3/4 tsp

baking powder

1/4 tsp

baking soda

1/2 tsp

salt

2 sticks

unsalted butter, softened

3 oz

milk chocolate (e.g. 42% cocoa)

3 oz

dark chocolate (e.g. 70% cocoa)

3/4 stick

unsalted butter

1/2 cup

sour cream or crème frâiche

1 tsp

vanilla extract or vanilla bean paste

1 tbsp

golden syrup (or light corn syrup)

2 1/4 cups

icing sugar, sifted