Wash the meat and place in water to boil. When it comes to the boil, skim off the foam, add in a bay leaf and an onion cut into four. Now make a low heat and let simmer.
If you ask me for how long, I will tell you it depends on how lucky you were with the meat. If it's younger , then boil for 2 hours, if older, even 3-4 hours over low heat. What matters is that it's properly cooked through and soft.