Begin by marinating the sirloin steak in a mixture of mirin, minced garlic, grated ginger, and sesame oil. Let it sit for at least 30 minutes.

Heat a large skillet or wok over high heat until it's smoking hot, about 3-5 minutes.

Remove the sirloin from the marinade and place it in the hot skillet. Sear the steak for about 4-5 minutes on each side until done.

In the same skillet, add a touch more oil if needed, then toss in diced carrots, zucchini, and mushrooms. Sauté for about 3-4 minutes.

Slice the rested steak into thin strips and add it back into the skillet with the veggies. Stir to combine.

Prepare a bowl with fried rice as the base and spoon the steak and vegetable mixture on top.