Sprinkle sirloin with salt. Toss with cornstarch until well coated.
In a Good Cook 9" Cast Iron Pan, heat coconut oil over high heat. Once oil is hot, cook 6-8 strips at a time, until golden brown. Transfer to a paper-towel lined plate. Once all beef is cooked, pour any extra oil from the skillet. No need to scrub the skillet clean, a few fried bits will help season the glaze.
Add brown sugar and orange juice to skillet. Cook over medium-high heat, whisking constantly, until thickened. (About the consistency of maple syrup). Whisk in soy sauce, chili garlic sauce and orange zest. Toss beef and broccoli florets into skillet. Stir with a wooden spoon until broccoli is tender.
Serve over sticky rice, if desired.