I know this marbled glaze is impressing you right now. Let me tell you, the cake underneath is equally impressive. It's incredibly dense and rich in texture, and ultra-chocolatey in flavour. That's thanks to not only the deliciously dark chocolate in the mixture. But also the cacao butter. That's right - cacao butter. It's a wonderful ingredient to use in baking when you want to boost the chocolate flavour. Cacao butter also works as a great substitute for butter when you're going dairy-free. As cacao butter contains less water than regular butter, it gives an extra dense texture to cakes and...