Combine chicken broth, cornstarch, soy sauce, rice vinegar, Mirin, sesame oil, sugar and Asian chili sauce in a small bowl.
Preheat non-skillet over medium high heat with 1/2 tablespoon coconut oil. Add beef and stir fry until beef is cooked through, 3 4 minutes. Remove from pan.
Add remaining coconut oil and saute broccoli for 3 4 minutes until crisp-tender. Add chicken broth or water as needed to keep pan from becoming too dry.
Add beef and sauce into the pan with the broccoli and stir until sauce thickens, 4 5 minutes.
Serve over rice.