how long to cook beef joint in slow cooker
1 Put joint (beef, lamb, pork, ham) or fowl either fresh or frozen, in slow cooker and switch on. 2  Leave 6 to 8 hours at medium or low, depending on the slow cooker.3  After that time joint will be cooked and there will be plenty of meat juices to make delicious gravy.4  Heat oven to high.ethod. 1  Put joint (beef, lamb, pork, ham) or fowl either fresh or frozen, in slow cooker and switch on. 2  Leave 6 to 8 hours at medium or low, depending on the slow cooker. 3  After that time joint will be cooked and there will be plenty of meat juices to make delicious gravy. 4  Heat oven to high.