In a small bowl whisk together hosin, green onions, soy sauce, rice vinegar, garlic, ginger, sesame oil and sugar.  Pour marinade over meat strips in Ziploc bag.  Seal bag and chill for at least 30 minutes or up to overnight.  

Drizzle 1 tablespoon of oil in a large skillet over medium-high heat.  Using tongs, transfer meat strips from bag to skillet, keeping marinade in bag.  Cook for 4-7 minutes or until well browned on the outside.  Transfer to a plate and allow to rest while you do the next step.

Add the other 1 tablespoon of oil to skillet.  Add mushrooms and onion, cook for 3-5 minutes or until onion is translucent and mushrooms are soft.  Then add red pepper, ramen noodles, ramen seasoning, cooked beef strips and the beef marinade from bag to the skillet with onions and mushrooms.  Pour water over the top and cook over medium heat until noodles are tender and cooked through.  Garnish with green onions {if desired} and serve immediately.