While the broccoli is cooking, make the beef. In a large, tall-sided skillet, heat 1 tablespoon of the avocado oil over medium-heat.
Once hot, add the beef, diced onions, and the white parts of the green onions. Cook the beef, breaking it up with the back of a wooden spatula, and stirring occasionally until the meat is no longer pink, about 7 minutes. Using a strainer, drain off any excess liquid. Do not rinse the meat. Set aside.
Turn the skillet up to medium-high. Add 1 tablespoon of avocado oil. Once hot, add the garlic, ginger, and tomato paste. Stir to combine, sauteing until fragrant, about 1 minute.
Add the beef back to the pan and toss to combine. Add in the sriracha, coconut aminos, rice vinegar, salt, garlic powder, and pepper. Toss to combine and spread into an even layer. Cook, undisturbed, for 4 minutes, or until the sauce begins to caramelize.
Stir, add the beef broth, and cook for another 3 to 4 minutes, or until the liquid has absorbed. Remove from the heat and add the sesame seeds and the green parts of the green onions.