In a mixing bowl, combine soy sauce, sesame oil, brown sugar, garlic, and ginger. Add the flank steak and marinate for at least 15 minutes.

Preheat the grill or skillet over medium-high heat. Remove steak from marinade and cook for 5-7 minutes on each side, or until desired doneness.

Let the steak rest for a few minutes before slicing it thinly against the grain.

In a small bowl, whisk together sour cream, Sriracha, lime juice, and honey until smooth.

In serving bowls, place a scoop of cooked rice, top with sliced steak, and add a variety of vegetables.

Drizzle the spicy cream sauce over the top and garnish with additional green onions if desired.