I love baking from scratch using fresh, wholesome, affordable ingredients. My daughter and I love spending time like this. I remember my mom baking from scratch. This recipe I came up with by just thinking it might be a good idea to add chocolate and orange to a basic sponge - surprise, surprise, it works. I usually use lemon in a lemony sponge (I'll post that recipe later!). I took it to work at 7, it was all gone by 10! Not everyone had a slice either, I have been strongly advised to please make some more! Will do, on my days off! Hope someone else out there likes it. It's not very chocolaty - just a little! Let me know if anyone has issues, I'm not a professional.
Alternatively, instead of the chocolate buttons, you can melt dark chocolate in the microwave or in a double boiler and then spread it over the cake.