Purple Geode Cake frosted to look like a galaxy with a carved indent filled with purple and pink rock candy and silver leaf edging

A geode cake is not for the faint-hearted. Let me just put it out there straight away. It’s basically a large, layered and frosted cake with a cavity sliced out of it and then filled with various sizes of rock candy. If you’re looking for a quick and easy way to decorate a  cake, this isn’t it. But I’ve got plenty ideas here and here. If you’re up for a challenge though, and want some serious wow-factor? Make this baby! I’ve said numerous times I’d never make a geode cake, but when one of your best friends turns 50 and has a mild obsession with quartz and crystals, then well, you put aside your issues and make it happen! It also may have something to do with with the fact that I didn’t tackle it alone, I joined forces with my cake partner in crime Love Life Cupcakes. Here’s how we did it:

Purple Geode Cake frosted to look like a galaxy with a carved indent filled with purple and pink rock candy and silver leaf edging

WHAT YOU’LL NEED:

5 x 25cm vanilla cake layers (I used this recipe)

2 x 15cm vanilla cake layers

1 x quantity vanilla buttercream 

Purple food colouring gel

Fushia food colouring gel

Black, purple, pink and silver rock candy sugar swizzle sticks (available here)

Silver leaf (or silver glitter)

Black dusting glitter

Close up of the purple geode cake with rock candy sugar crystals and silver leaf