Easy Beef Barley Soup: Two Ways Hubby was telling me about a delicious tomato soup he'd had recently. When I told him how much I love tomato soup, he just laughed. He knows I love every kind of soup! So, I suppose I need to be a little more specific when I talk about my favorites. When it comes to soups with a rich, beefy flavor, beef barley soup is at the top of my list. This is one of my favorite ways to use leftover roast beef. Instead of serving the same roast beef dinner twice, you can turn those leftovers into a completely different meal. Tender vegetables, hearty barley, diced tomatoes, and savory beef broth come together to make a satisfying soup that's perfect for a chilly day. This post contains affiliate links. You can make this beef barley soup in your slow cooker or on the stovetop. Either way, it's an easy, comforting dinner that makes good use of what you already have in the refrigerator.