- Large cast iron
Combine the soy sauce, sesame oil, sugar, cornstarch, pepper, and water in a bowl, stirring until the sugar has dissolved. Cut the steak into thin strips.
Place a large cast iron over medium heat and add 2 Tbsp olive oil. Add the broccoli florets and sauté 5 minutes until cooked through - broccoli will be bright green and crisp-tender.
Remove the broccoli into a bowl.
Increase the heat to high and add another Tbsp of oil. Add the beef in a single layer, sautéing 1-2 mins per side until lightly browned. Be careful not to overcook.
Pull the pieces off into the same bowl as the broccoli.
Reduce the heat to medium/low and add the sauce, simmering for 4-5 minutes until thickened. Add back in the broccoli and beef and stir.