Blackberry jam crumb cake

Not one to be afraid of massive amounts of ingredients – I have made this cake, after all – I must confess that I almost gave up baking the cake on the photo. Almost. Reading the recipe with a calculator on hand I shrieked at the idea of using nearly 400g of butter, 500g of sugar and – my goodness – over 700g of flour in one single cake; a recipe that would pretty much empty my entire pantry. :