Believe me Sparkie, I am no expert, but you don't cook/bake them, you steam them.
If you haven't got a steamer, would put in a pan with water half way up and simmer, pan lid on .. not sure of the cooking time, but if meat raw could be a few hours, however, presume the meat is already cooked and just needs warming up, so 40 minutes ? .. just a guess like, haven't done one myself for years ...
There will be ladies on here later in the day to give you more expert advice I am sure.