Fabulous Tiramisu-like cake from the book 'Feast'. You can use store-bought chocolate cake for the base, but be sure then to cut down on the sugar in the syrup, the cream and the glaze because Nigella's home made cake isn't sweet and that's perfect for this recipe. I find it easy to assemble the cake by putting only the cake ring on a plate (forget the tin bottom), line the sides with baking parchment, then assemble the whole thing and follow Nigella's guidelines. After you take it out of the fridge, carefully remove the cake ring and baking parchment and you'll get a very pretty end result. I suggest you cut down on the syrup in the glaze anyway, otherwise it will be too sweet. Actually I find this cake much more delicious and beautiful than Tiramisu!!