Chocolatier-on-wheels Petra Barran loves a good chocolate pudding and wants to bring it over to yours for dinner. She talks to Londonist as she gets ready to embark upon her Chocstar Tour of Britain. Tell us about your business selling chocolate on wheels, Chocstar. Where did the idea come from? I wish I could tell you when it popped into my head! I spent five years out of the country travelling all over the......