In a bowl, whisk together soy sauce, water, rice vinegar, sugar, minced garlic, ground ginger, and crushed red pepper flakes to prepare the teriyaki sauce.
In a small bowl, stir corn starch into cold water until completely dissolved to make a cornstarch slurry.
Heat sesame oil in a large skillet over medium-high heat. Add the thin strips of beef and sauté for 2 to 3 minutes until browned.
Add snow peas and broccoli florets, continuing to sauté for another 2 to 3 minutes until vegetables are tender but still crisp.
Pour in the teriyaki sauce mixture and bring to a gentle boil.
Slowly stir in the cornstarch slurry, continuing to stir until the sauce thickens and coats the beef and veggies.
Reduce heat to low and stir in the cooked ramen noodles and chopped green onions, mixing everything evenly.
Serve hot, garnished with sesame seeds if desired.
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Notes
Leftovers can be stored in an airtight container in the fridge for up to 3 days.