In a large bowl, mix together sirloin, cornstarch, salt and pepper. Set aside.
Heat a large skillet over medium heat. Add olive oil and then add sirloin. Brown the meat, remove from skillet, and set aside.
Add scallions to the skillet and cook 2-3 minutes until starting to soften.
In a small bowl, whisk together the soy sauce, honey, ginger, garlic, sesame oil, and rice vinegar. Add the sauce to the scallions and bring to a light boil. Reduce to simmer. Mix together the 1/2 tsp cornstarch and 1 tsp of soy sauce until no lump, add to the sauce. Stir and simmer until sauce thickens a little.
Add back sirloin, stir and simmer another 1-2 minutes.
Serve over ramen, rice, vegetables.