In a medium bowl, whisk together soy sauce, chicken stock, honey, vinegar, brown sugar, garlic, sesame oil, cornstarch, Sriracha, ginger, red pepper flakes and ¼ cup water; set aside.
Heat olive oil in a large skillet over medium high heat. Add steak and cook, flipping once, until browned, about 3-4 minutes. Stir in broccoli and soy sauce mixture until tender and slightly thickened, about 3-4 minutes.
Serve immediately.
Recipe by Columbine Kitchen at https://columbinekitchen.com/?p=1770