In a large bowl, whisk the soy sauce, honey, vinegar, cornstarch, ginger, garlic, and sesame oil.

In a large non-stick skillet over medium heat, add the broccoli florets and water and cover with a tight-fitting lid. Allow the broccoli to steam for 5 minutes. Use a slotted spoon to remove the broccoli from the skillet to plate. Remove the water from the skillet and wipe with a paper towel.

In the same skillet used to cook the broccoli, heat the avocado oil over medium high heat. Add the beef and onion and cook for 7 minutes, until almost cooked through and browned.

Add the marinade on top of the beef, and continue to cook until the marinade has thickened and the beef is fully coated with the marinade.

Add the reserved broccoli back to the skillet and toss to combine with the ground beef mixture. Remove from the heat and serve over rice, if desired.