Step 1

In a medium bowl, whisk together the soy sauce, rice vinegar, sesame oil, sugars, chili sauce and black pepper. Taste and adjust ingredients to your liking.

Step 2

Pour 1/4 cup of the sauce in a shallow container or ziploc bag, add the steak and marinate in the refrigerator for at least 30 minutes. Set the remainder of the sauce aside.

Step 3

After marinating, cook the spaghetti according to package instructions.

Step 4

While the water is boiling, remove steak from marinade (discard liquid) and cook the steak in a pan over medium-high heat to desired doneness (no more than medium for best results).

Step 5

Remove steak from heat and let sit for a few minutes before slicing thinly across the grain.

Step 6

Drain the pasta well and transfer to a large bowl. Add the sesame sauce while noodles are warm and toss to combine.

Step 7

Add green onions, sesame seeds and toss again. Top with sliced steak and cilantro. Also great served cold!