Combine ground beef and onions in a pan and cook over medium heat until meat is browned & cooked through. I use this handy tool to finely crumble the meat. Drain & remove grease from pan.
While the ground beef and onions are cooking, make the sauce. Combine the sauce ingredients in a small bowl, and stir to combine.
Add sauce mixture to the cooked ground beef and stir. Simmer over medium heat for about 5 minutes.
Serve over hot cooked rice (use a rice cooker for perfect rice every time). Top with chopped green onion.