Add the beef stew meat to the slow cooker.
Place the sweet potato cubes, diced onion, carrot slices, and minced garlic on top of the beef.
In a small bowl, whisk the tomato paste into the beef broth until smooth, then pour the mixture over the ingredients in the slow cooker.
Add the rosemary sprigs, bay leaf, salt, and pepper.
Stir gently to combine everything, then cover and cook on low for 8 hours.
Remove the rosemary sprigs and bay leaf before serving.