At the heart of any extreme cakes lies a brilliant idea and, when it comes to dreaming up these original designs, 31-year-old Nastassja Lusengo knows the sky's the limit. She's been commissioned by a client to produce a cake for her brother's wedding, inspired by a geode rock and will split open to reveal shimmering sugar crystals carved into the cake's interior. Essex's Eloise Durrant has a totally different challenge on her hands - producing cake for a Hawaiian themed party that includes a fully working cocktail dispensing water feature, four tiers of cocktail flavoured sponge cake and is decorated to look like a Pacific volcano.