Slice the steak into thin, bite-sized strips and season evenly with the sea salt and black pepper.
In a small mixing bowl, whisk together the tamari, sriracha, toasted sesame oil, grated ginger, and minced garlic to create the spicy glaze.
Heat the avocado oil in a large stainless steel or cast iron skillet over medium-high heat until it begins to shimmer.
Add the broccoli florets to the skillet and sauté for 4-5 minutes until they are tender-crisp and develop slight charred edges, then remove them from the pan and set aside.
In the same skillet, add the steak strips in a single layer, working in batches if necessary to avoid crowding, and sear for 2 minutes per side until a deep golden crust forms.
Pour the prepared spicy glaze over the steak and return the broccoli to the pan, tossing everything together for 1 minute until the sauce thickens and coats the ingredients.
Place the warm cooked rice in the base of a bowl and top with the spicy steak and broccoli mixture.
Garnish the bowl with thinly sliced green onions and red pepper flakes before serving.