Combine soy sauce, brown sugar, sesame oil, minced garlic, and grated ginger in a bowl. Mix well and add the thinly sliced beef, ensuring it’s well-coated. Allow it to marinate while you prepare your rice and vegetables.

Cook the rice according to package instructions.

Heat a large skillet over medium-high heat. Add the marinated beef and cook for about 5-7 minutes, stirring frequently until browned and cooked through.

Toss in the mixed vegetables and stir-fry for another 2-3 minutes until they're tender-crisp.

In a small bowl, mix the mayonnaise with sriracha. Adjust to taste.

Start with a base of steamed rice, followed by the beef and vegetable mixture. Drizzle the creamy spicy sauce over the top and garnish with sliced green onions and sesame seeds.