Mine was created in Photoshop.
I took photos, using a crappy little Pentax, of freshly baked pies from various brands before I settled on the pie I bought from Waitrose. I also took shots of biscuits like digestives, hob nobs and bourbons. I settled on a custard cream, though the chocolate covered digestive was a very close second. I then went back to Photoshop and experimented with fonts, font colours, filters on the pie and biscuit and backgrounds. Because I wanted the pie to look like it was breaking out of the header, I used shadows to give depth and made the bottom white so it blended with the rest of the theme. Finally, I put all the elements together and... voila!