Directions
Whisk all the sauce ingredients together and set aside.
If using broccolini, blanch in boiling salted water for 3 minutes. Drain and dry very well.
Season the beef with salt and pepper.
Heat olive oil in a sauté pan over high heat. Sear the beef for about 2 minutes per side, or until browned. Transfer to a plate and cover loosely with foil.
Add the onions to the same pan and stir-fry for about 2 minutes.
Add the sauce mixture and bring to a boil. Cook until thickened.
Add the broccolini, if using, and cook for 1 minute.
Return the beef to the pan and coat well with the sauce.
Serve hot over rice.
