Mix mirin, soy sauce and cornstarch in a limited bowl.
Warmth oil in a devoted nonstick skillet over medium-excessive heat. Spread steak out within the pan and cook dinner unless seared on one aspect, about 1 minute. Add garlic, jalapeno and ginger and cook dinner, stirring, unless fragrant, about 30 seconds. Add bean sprouts and spinach (the pan will be very corpulent). Pour the mirin combination into the pan and accelerate gently unless the sauce thickens and the spinach is wilted, about 3 minutes. Hurry in cilantro and sesame oil. Support topped with sesame seeds (if utilizing).
In the occasion you have gotten gotten a shrimp beyond regular time earlier than dinner, keep the steak within the freezer for approximately 20 minutes to encourage originate it simpler to gash thinly.
To toast sesame seeds, heat a limited dry skillet over low heat. Add sesame seeds and accelerate repeatedly unless golden and fragrant, about 2 minutes. Transfer to a limited bowl and let frosty.
Present: Mirin is a low-alcohol rice wine a have to have to Eastern cooking. Leer for it within the Asian or gourmet-ingredients piece of your grocery store. An equal portion of sherry or white wine with a pinch of sugar would perchance well also very properly be substituted for mirin.
Folk with celiac disease or gluten-sensitivity would perchance well also indifferent employ soy sauces that are labeled “gluten-free,” as soy sauce would perchance well also own wheat or varied gluten-containing sweeteners and flavors.