Slice the beef very thin. Then slice into strips. Add the strips to a bowl add in the vinegar, ginger, pepper, sugar, honey, sesame seed oil, salt, and vegetable oil.

Add the cornstarch and stir, incorporate well. Let it marinate for at least an hour.

Heat a pan or wok. Heat the oil and slice the onions. Add the onions to the oil stirfry for 6 minutes, add the beef and stirfry for 7 minutes.

Add pasta water, more if needed, stir it's going to start thickening. Add in the teriyaki and butter. Dip the pasta into the stirfry coating the pasta with the sauce. Serve I hope you enjoy!!!