Heat the olive oil in a large pot over medium-high heat. Season the steak with salt and pepper, then add it to the pot. Sear for 3–4 minutes until browned on the outside. Remove the steak and set aside.
In the same pot, add the garlic and ginger. Sauté for about 1 minute, stirring frequently, until fragrant.
Pour in the beef broth, soy sauce, rice vinegar, and sesame oil. Bring the mixture to a gentle simmer.
Add the sliced mushrooms and shredded carrots. Simmer for 5–7 minutes, or until the vegetables are tender.
Add the ramen noodles directly to the pot. Cook according to package directions, usually 3–5 minutes, until the noodles are soft.
Thinly slice the seared steak. Taste the broth and adjust seasoning as needed. Ladle the ramen into bowls and top with sliced steak, green onions, and sesame seeds.
Cook the noodles at the very end: Add the ramen only when the broth is ready and simmer just until tender; overcooking will make the noodles soft and gummy.
Taste and adjust the broth: Balance the flavor by adding extra soy sauce for saltiness, a splash of vinegar for brightness, or chili flakes for heat.
Make a low-carb version: Swap the ramen noodles for zucchini noodles (zoodles) and add them during the last minute of cooking so they stay firm.
Turn up the heat: Stir in chili paste, chili crisp, or sriracha to turn this into a spicy beef ramen with minimal effort.
Boost the vegetables: Add snow peas, bok choy, spinach, or bean sprouts during the final minutes of simmering for extra texture, color, and nutrition.