In a bowl, combine soy sauce, mirin (or apple juice), sesame oil, minced garlic, and grated ginger to create the teriyaki marinade.
Add the thinly sliced steak to the marinade, cover, and let it marinate for at least 15 minutes, allowing the flavors to infuse.
Heat a large wok or skillet over medium-high heat. Once hot, add a tablespoon of oil.
Remove the steak from the marinade (reserve the marinade for later) and stir-fry in the pan for 2-3 minutes, until it’s browned but not fully cooked. Remove from the pan and set aside.
In the same pan, add the broccoli florets and bell pepper slices. Stir-fry for 3-4 minutes until they start to soften.
Add the snap peas and continue to stir-fry for another 2 minutes, ensuring the vegetables remain vibrant and slightly crunchy.
Return the steak to the pan along with the reserved marinade. Toss everything together and cook for an additional 2-3 minutes, until the steak is cooked through and the sauce has thickened slightly.
Remove from heat and garnish with chopped green onions and sesame seeds.
Serve hot over cooked jasmine rice or noodles.
Notes
For a sweeter alternative, you can use apple juice instead of mirin.