I have, in the kitchen, a Sussex Pond Pudding. This is, to a first approximation, a lemon in a pie crust, which is then steamed for 3 1/2 hours. The internet tells me it will undergo a miraculous alchemy and turn into food. I have my doubts, but I am game to try.
I suspect my not-a-pudding-mold substitute may be the most likely failure point, as it is more or less the right size but rather flatter than it should be.