In a bowl whisk together all of the ingredients for the sauce and set aside. If making it whole30, combine the ingredients along with the dates in a blender and blend until smooth.
Heat the sesame oil in a wok or cast iron skillet on high heat and add in the sliced onion, ginger, garlic and green onions. Cook for about 3 minutes until the onion becomes translucent, stirring constantly to ensure it doesn’t burn.
Add in the beef and cook for 1 to 2 minutes until just seared. Transfer the beef and onion mixture to a plate and set aside.
Pour the sauce into the pan and let it simmer for about 4 minutes until it begins to thicken. Once the sauce has become thick return the beef and onion mixture to the pan, toss in the sauce and heat for just 20 seconds or so until everything is warmed through. Sprinkle with cilantro before serving.