Hermione Birthday Cake Tutorial

little girls dressed up as Hermione Granger

There are worse book characters to idolise than Hermione Granger

The youngest children in all families are inevitably influenced by their older siblings, and Mini is no different. She learned to read better so that she could read her sisters’ favourite Harry Potter books. She’s such a huge fan that I am now the only one in the house who’s never read them, nor am mad-keen on everything Harry Potter.

So for her 7th birthday, Mini asked for a Harry Potter-themed birthday party (more in another post) and a birthday cake for her actual birthday that had “something to do with Hermione Granger”. Hmmmm, no challenge for this non-HP fan, then (!)

I decided to do a fairly simple book cake, and call it Hermione Granger’s Diary. I took photos of the process so that I’d remember it for her more complex birthday party cake later that week. And as a bonus, I can use them as a tutorial to show you how easy it was. Remember, I’m not a great cook or a talented cake decorator – if you take your time and follow my top tips, you’ll produce something far, far better. Please share your own hints and tips too!

Hermione cake Harry Potter

Hermione’s Diary Cake

  1. OK, start the day before by baking the cakes and preparing a cake board. Don’t bother buying a board. Just get some stiff cardboard (I cut a bit off a packaging box, but have been known to use a couple of empty cereal boxes) and cover it entirely in tin foil. This makes it look good, gives you something big enough to work on, makes the cake portable, and it’s also easy to wipe crumbs and smears off the side.

  2. Make 2 loaf-cakes and let them cool completely. Maxi suggested I make them both chocolate and orange marble cakes and so I used double the recipe at the link. I didn’t ice them with the drizzled chocolate and I didn’t use food colouring.

  3. Make up a batch of plain buttercream. I used a block of unsalted butter (250g), 2 cups of icing sugar, and my all-time favourite method of making Whipped Buttercream Icing.

  4. Using a sharp knife, cut the top off the loaves on a bit of a slant. This shapes the cakes so that they’ll look a bit like an open book when you press them together. If you were neater than me, you would cut the tops off entirely so that there are no curved edges. If you’re worried about the cakes becoming too thin, you could raise them up by slicing each loaf in 2 and filling with jam and/or cream at this point.

  5. In the interests of thrift, crumble the bits of cake you sliced off and mush them together with a spoon or 2 of buttercream. Effectively you’re making a batch of cake pops, but you’ll use it like mortar to hold the 2 loaf-cakes together.

  6. Put a smear of buttercream on your cake board and place a loaf cake on top (this will hold it down). Squish the cake-pops mortar along the side of the cake, then smear more buttercream on the board and stick the second loaf-cake to the first. Really squish the cakes together.

  7. Now cover both cakes in the rest of the buttercream. Don’t worry about getting crumbs in the icing: it really doesn’t matter because it’ll all be covered in fondant icing.

  8. Roll out some white fondant or ready-roll icing to form the pages along the sides of the cake. I used a 500g block in grand total, but you might need more or less: it depends how thinly you roll the icing. You could be extremely neat and cut them into beautiful rectangles, or you can be slap-dash like me and just wodge them on. I used the excess fondant icing to start to disguise the misshapen bits of loaf-cake, but as I said in (4) above, you could avoid that by slicing the tops neatly and more severely.

  9. Use a blunt edge (spatula, back of a long knife, etc.) along each side to make lots of page marks. The layer of buttercream under the fondant icing will help.

  10. Dip a clean paint brush in some cocoa and use it to brush the edges of the pages to make them look old and dirty. I’m not sure that Hermione’s diary would actually be so grubby, to be fair, but I wanted to try out the technique.

  11. Roll out more white icing and place over the top of the cake. Shape it with your hands so that it looks like an open page. Brush more cocoa along the edges and on the ‘pages’. Roll some coloured fondant icing (or colour the last of the white fondant icing with some food colouring) into long thin sausage shapes and place them around the edges to look like the book’s cover, peeping out from under the pages. Flatten the sausages with a flat edge on top and at the side. If you have any black icing, add a little arch in the middle of the front and back to look a bit like the empty space where the edges of the pages curve away from the book binding. (Or just brush lots of cocoa in that corner to achieve the same / a better effect).

  12. Decorate! I used a pen that writes on icing to write something, and made a bit of a bouquet of roses with a tiny bit of green fondant icing I had leftover from The Boss’s birthday cake last month and some shop-bought icing flowers. I shook some little white chocolate stars over the top to use them up (they’ve been lurking in my cupboard for too many years… I swear they’re breeding…).

  13. Add some candles and go!

One thought on “Hermione Birthday Cake Tutorial

  1. Pingback: Mini’s Harry Potter Themed Birthday – Party Prep | (Reasons Why I'm A) Grumpy Old Trout

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