Let me just say as a man who as actually eaten capybara, that it is not tasty. I do not know why someone would be looking for a recipe, even if they are permissible for Catholics during Lent.
The carpincho, as it is known in Paraguay, is a river-dwelling hamster-like creature the size of a pig. Some people say they resemble Rodents Of Unusual Size from Princess Bride. That's not true. They don't look alike.
But they do TASTE alike. Blecch.