Place Sirloin Steak in the freezer for 1-2 hours prior to slicing (this helps make slicing thin, even pieces easier).
In a medium saucepan, combine all sauce ingredients. Bring mixture to a light simmer, for 5-6 minutes, stirring occasionally, until sugar is fully dissolved and sauce is fragrant. Remove from heat and set aside.
Remove Sirloin Steak from freezer. Trim visible fat off of steak. Slice steak, against the grain, into thin ¼" strips.
Pour ¾ of marinade over beef, mixing to ensure an even coating. Reserve remaining ¼ marinade for a drizzling sauce at the end. Place beef into the fridge while vegetables are being prepared.
Wash, dice, and chop vegetables. If desired, swap fresh vegetables out for your favorite frozen blend.
Heat a cast iron skillet and a splash of avocado oil over medium high heat. While pan preheats, drain excess marinade from beef. This will help reduce buildup of caramelized sauce in the pan. Cook strips for 2-3 minutes, each side, until it reaches an internal temperature of 145°F.
While beef cooks, boil a pot of water and cook your preferred noodles.
Now that all components are prepared, it's time to build your bowls! Just prior to serving add a final drizzle of your Garlic-Sesame Sauce. Enjoy!