Start by slicing your chosen beef into thin strips. Combine soy sauce, gochujang, sesame oil, brown sugar, minced garlic, and black pepper in a bowl. Add the beef strips, coat well, and let marinate for at least 30 minutes.

Prepare the creamy sauce by mixing mayonnaise, sriracha, sesame oil, garlic powder, and a pinch of sugar until smooth. Refrigerate until serving.

In a large pot, bring water or broth to a simmer. Add gochugaru, soy sauce, rice vinegar, sesame oil, and salt. Simmer for 5 minutes; then add ramen noodles and cook until al dente (about 3 minutes).

Preheat a grill or skillet over high heat. Cook the marinated beef for 2-3 minutes per side until caramelized. Rest for a few minutes before slicing against the grain.

Divide noodles and broth into serving bowls. Top with sliced beef, drizzle with creamy sauce, and garnish with green onions and sesame seeds.