Scrape off some frosting from two of them -- you can also go with just two cakes if you prefer a shorter stack, but in that case, you might need to "borrow" frosting from both. Pile the scraped ...

Grease a 23cm/9in springform cake tin with a little oil and line the ... beating as you go, and when all is scraped in you can slowly tip in the ground almonds (or flour) mixture.