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Season the beef chunks generously with salt and pepper. If you have time, brown them in a hot skillet with a tablespoon of oil for a better flavor. This is optional but worth it.
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Place the potatoes, carrots, and onion in the bottom of a 6-quart slow cooker.
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Place the beef on top of the vegetables. Add the garlic, tomato paste, Worcestershire, thyme, and bay leaves.
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Pour the beef broth over everything. Cover and cook on LOW for 8 hours or HIGH for 4-5 hours, until the beef is falling-apart tender.
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Remove the bay leaves. If you want a thicker stew, stir in the cornstarch slurry and let it cook on HIGH for another 10 minutes.
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Taste and adjust the seasoning. Serve in big bowls with crusty bread. This is the kind of meal that's waiting for you when you walk in the door on a cold day.