Process ingredients in a food processor until a coarse paste is formed.
Season to taste with salt and pepper.
Refrigerate until required.
Rub oil and salt all over the beef short ribs and allow to stand for 1 hour at room temperature.
Cook ribs in a Weber, with lid on, over a medium heat for 1½-2hrs; alternatively the ribs can be cooked in an oven at 180°C for the same amount of time.
Allow meat to rest for ½ hour before carving, serve with chimichurri.