Step 2: Add the Beef and Vegetables to the Slow Cooker - Transfer the browned beef into your slow cooker, then add the diced carrots, sweet onion, celery, and minced garlic. Pour in the crushed tomatoes and beef broth, making sure the ingredients are surrounded by liquid. Give everything a gentle stir to distribute the vegetables evenly throughout the pot. At this stage, the broth will look fairly thin, but that is completely normal. As the beef and vegetables cook, their flavors will blend into the liquid, creating a rich and comforting stew. If your skillet has flavorful browned bits stuck to the bottom, you can loosen them with a splash of the measured beef broth and pour that into the slow cooker too.