My recent fish pie with waves post has inadvertently reignited an old controversy. Not the lamb v beef cottage / shepherds pie polemic but something I had not foreseen. It started pretty innocuously. At work, Matt started out being quite complementary about my wavy topped fish pie. This led to a discussion about the right toppings for different pies. The conversation moved around the office but agreement was not reached. I now need to make a stand and draw up the definitive set of rules.