Thinly slice the beef.
In a bowl, mix marinade ingredients. Add beef, ½ chopped white onion, and green onions.
Heat a pan over high heat. Cook the marinated beef in batches for about 4 minutes.
In a bowl, toss together all cucumber salad ingredients.
Serve beef with rice and cucumber salad. Garnish with more green onions or sesame seeds if desired.
