Season the flank steak well with half of the salt, and the pepper on both sides. Thinly slice against the grain.
Combine the coconut aminos, lime juice, coconut sugar, and arrowroot in a bowl and whisk well. Set half of the mixture aside, and use the other half to marinate the beef. Set aside.
Using a large pan or wok, heat the avocado oil on medium heat. Cook the cauliflower rice for 5-7 minutes and lightly salt. Remove from the pan when cooked to liking.
Add more avocado oil if needed and cook the broccoli and lightly salt. Cook for 6-7 minutes and set aside.
Add more oil if needed and add the steak slices with the marinade juices to the pan in two batches to avoid overcrowding. Cook for 2-3 minutes on each side or until browned. Set aside.
Add the garlic and ginger to the pan and cook for 2 minutes or until slightly fragrant.
Pour in the remainder of the coconut aminos mixture along with the chicken broth for cook for 2 minutes to allow the sauce to thicken and reduce.
Add the steak slices and broccoli back to the pan and cook for another minute or two to reheat. Top with green onion and sesame seeds at the end.
Assemble 3-4 meal prep containers with cauliflower rice on one side and beef and broccoli on the other.