Bring a large saucepan of water to the boil. Add the beef, turn the heat down to low and simmer gently for 30 minutes until the beef is cooked through. Remove the beef from the water and set to aside to cool.
Meanwhile, heat the oil in a large saucepan over a medium heat. Add the onion and garlic and cook, stirring occasionally, for 6–8 minutes, or until the on