Mix the soy sauce, rice wine vinegar and sweetener in a small bowl and set aside.
Heat a dry non-stick pan over medium heat, add the beef and cook for 7-10 minutes, until cooked through.
Move the beef to one side of the pan, then add the sesame oil, ginger and garlic. Cook for 1 minute.
Add the already prepared sauce and toss the beef to coat. Cook for 1 minute mixing everything.
Slightly heat the spiralized zucchinis with the beef (if eating straight away), or divide zucchini and beef into containers. Heat in the microwave or pan when needed.