I am not sure there are a lot of recipes for this type of meat as it is claimed.
Mostly it is either slow roasted in an oven or slow cooked in a stew with some variations on stew ingredients.
The main difference is in the longer cooking time and in preparing the meat.
Traditionally people remove the lymph nodes from certain areas under the legs and some of the nearby fat tissue. Otherwis this tissue will give a really unpleasant taste/smell to the cooked meat.
I was under the impression (my personal take) that there are quite a few different ways to prepare them though, although the end result (the dish itself) is similar.
This is the wikipedia page talking about the most famous dish: https://pt.wikipedia.org/wiki/Chanfana
This is one of the recipes: https://aldeiasdoxisto.pt/artigo/531
Do you have a trusted source for this?
A quick search query using my favorite search engine tells otherwise. But that's just random internet information.
https://www.huffpost.com/entry/most-consumed-meat-in-world_n...
Although to be fair, pork makes way more sense.
I'd love to get hold of some, it'd be good for cooking chamois and tahr in my country.
Fun fact, goat is the most widely eaten meat in the world.