In saucepan, add soy sauce, brown sugar, Sriracha sauce and chicken stock; bring to simmer while whisking. Simmer 4 minutes.

Cool mixture down until cool to touch, about 20 minutes.

Slice steak into thin strips and place in bowl. Pour marinade over steak and marinate for 1 hour.

In large pan over medium-high heat, stir-fry steak 2 minutes.

Remove steak from pan and allow to rest.

In same pan used for steak, add oil and cook hot or cold kit according to instructions on bag.

Add steak back to pan and stir to incorporate.

Garnish with toppings from hot or cold kit and serve.