To make the marinade, place the soy sauce, sesame oil, garlic, ginger, Sriracha, honey. and scallion whites in a container and whisk together.
Pour the marinade over the sirloin strips in a glass container. Cover and marinade for 1 hour or longer, if possible.
When you're ready to make the recipe cook the broccoli. Place the broccoli in a pot of boiling water until it turns bright green. This takes about 2-3 minutes. Then drain the broccoli and place it into a large bowl of ice water to stop the cooking process. Once the broccoli is cooled then drain and set aside.
In a large frying pan, heat 2 tablespoons of olive oil or any cooking oil.
Once the oil is hot add the beef. Reserve the leftover marinade, you'll use this after the steak is cooked to finish the sauce. It's likely you'll need to cook the beef in a couple batches. You don't want to crowd the pan because then the beef will steam instead of brown.
After the beef is cooked remove from the pan and set it aside.
Whisk together the beef broth and cornstarch until the cornstarch is completely dissolved. Then mix together the leftover marinade and cornstarch mixture. Pour into the same pan used to cook the beef.
Bring to a boil and then reduce to a simmer. Let it simmer until the sauce thickens.
Once the sauce begins to thicken add in the broccoli and steak. Toss to coat with sauce. Let it it cook for another 2-3 minutes or until heated through.
Sprinkle with the green part of the scallions and sesame seeds. Serve over white rice, brown rice, cauliflower rice, or keep it low carb and eat it as is.