Start by chopping the onion into medium pieces and slice the beef roast against the grain into strips. For bonus flavor, consider searing the beef in a skillet over medium heat for about 2 minutes per side until browned, then transfer it to the slow cooker.

In the slow cooker, add the beef, diced onion, beef broth, coconut aminos, minced garlic, toasted sesame oil, minced ginger, white wine vinegar, salt, Chinese 5 spice powder, and ground pepper. Stir all the ingredients well to ensure everything is evenly combined.

Cover the slow cooker and set it to cook on high for 3–4 hours or low for 6 hours. Check the beef for doneness; it should be tender and easily shred with a fork.

Once the beef is cooked, mix the arrowroot flour with an equal amount of room-temperature water to create a smooth slurry. Stir this mixture into the slow cooker.

Next, stir in the fresh broccoli florets, ensuring they are well incorporated into the sauce. Cover the slow cooker again and let it cook on low for an additional 10–15 minutes.

Once the broccoli is tender and the sauce has reached your desired thickness, serve your delightful Easy Whole30 Slow Cooker Beef and Broccoli over cauliflower rice or alongside steamed vegetables.