In a mixing bowl, whisk together mirin, minced garlic, grated ginger, and sesame oil until well blended. Place the sirloin steak into the marinade, ensuring it’s fully coated, and cover it. Let the steak marinate for at least 30 minutes at room temperature.

While the steak is marinating, wash and chop the carrots, zucchini, and mushrooms into bite-sized pieces. Set the vegetables aside.

After marination, heat a large stovetop skillet over high heat. Place the marinated steak in the skillet and sear for about 3-5 minutes on each side. Remove the steak and let it rest.

In the same skillet, add more sesame oil if needed and sauté the chopped vegetables for about 4-6 minutes until tender yet crisp.

Push the vegetables to one side of the skillet, and add pre-cooked fried rice to the empty side. Mix and stir for 2-3 minutes until heated through.

To serve, layer warm fried rice at the bottom of a bowl, followed by sautéed vegetables and sliced rested steak on top.