Place coriander seeds in a dry pan over medium heat and stir the seeds around the pan. The seeds will give off a strong aroma and will turn a golden brown colour. Remove the seeds and coarsely crush them. Cube all the meat and spek, mix together thoroughly and mince coarsely. Place meat in a large bowl, add all the dry spices, Worcestershire sauce and vinegar, mix together lightly with a two pronged fork. Place in fridge for about 2 hours to blend the flavours. Soak casings in water during this period. Fit casings to sausage maker and fill with mixture. Do not over or under stuff.