About Delia's sponge cakes
Can you please let me know what Delia Smith calls 'spreadable butter'. Is it soft unsalted butter or can I use Stork spreadable in a tub? Also if oven temperature suggests 170C - what temp should a fan oven be at? I looked this up on your site but it seems to suggest 20 degrees less than 170 which seems fairly low for a sponge but does this work?
Thanks for your help. The recipe I am looking at is the Iced Lemon Curd Layer Cake which has just recently come up on the site as Cake for the Day.