In a large mixing bowl, add the steak with a bit of olive oil and salt and pepper. Toss to evenly mix.
Heat your griddle to high heat and add the steaks pieces. Cook for 3-4 minutes tossing half way through.
In the same mixing bowl you used for the beef, add the gochujang, hoisin, soy sauce, sesame oil, lime juice and beer and whisk to evenly incorporate.
Once the steak as caramelized on all sides, add the some of the green onions, cilantro, red chilis and smashed garlic. Add ½ of the sauce over the top and toss. Cook for 2 minutes and then add the other half of the sauce and toss. Cook another 2 minutes and then add the steak to a platter.
Garnish with a bit more fresh cilantro and green onions and a sprinkle of sesame seeds.