Ingredients
Equipment
Method
Prep and sear
- Pat beef dry and season with 1 teaspoon salt and 1/2 teaspoon pepper; heat 1 tablespoon oil in a 12-inch skillet over medium-high heat and sear beef in batches 1–2 minutes per side until browned; transfer seared beef to the slow cooker.
Build in the slow cooker
- Add sliced onion, the smashed garlic cloves, tomato paste, remaining 1/2 teaspoon salt and 1/4 teaspoon pepper, beef broth, Worcestershire sauce, and thyme to the slow cooker; stir gently to combine.
Cook
- Cover and cook on LOW for 5 hours or on HIGH for 3 hours; at the halfway point (about 2.5 hours on LOW or 1.5 hours on HIGH) add the halved small potatoes and optional mushrooms, then cover and continue cooking until beef is fork-tender and potatoes are cooked through.
Finish
- Remove and discard the smashed garlic cloves and any herb stems; ladle about 1 cup of cooking liquid into a small saucepan and simmer until slightly reduced, then turn off heat and whisk in cold butter one tablespoon at a time until glossy; stir in minced garlic and parsley off heat.
- Pour the finished sauce back over the beef and potatoes, toss gently to coat, and adjust seasoning with salt and pepper before serving.
Notes
Sear the beef in batches for best browning; add potatoes midway to prevent them from becoming mushy. If you must use russets, add them later and reduce overall cook time slightly. Refrigerate leftovers for up to 4 days or freeze portions for up to 3 months; thaw overnight before reheating with a splash of broth.
