Slow Cooker Topside Roast Beef Samantha MilnerFebruary 08, 2021 678 Slow Cooker Roast Beef. How to cook a delicious topside roast beef in the slow cooker, including a healthy beef gravy. This slow cooker beef joint is incredibly tender and flavoursome and perfect for a slow cooker Sunday roast.Try itSee the full directions on my site