Brown the ground beef in a skillet over medium heat until no pink remains. Drain any excess fat.
Add the browned beef to the slow cooker along with the pearl barley, beef broth, carrots, celery, onion, potatoes, diced tomatoes, garlic, and thyme.
Season with salt and pepper. Stir everything to combine.
Cover and cook on low for 7 to 8 hours until the barley is tender and the vegetables are soft.
Ladle the stew into bowls and serve with slices of crusty bread on the side.
Notes
Check the stew near the end of cooking and add a splash of broth if the barley has absorbed too much liquid. The bread works best for soaking up the broth, and any leftovers reheat well the next day with a little extra water stirred in to loosen the texture.Course: Soup
Cuisine: American
Equipment: Slow Cooker, Skillet, Cutting Board