Bring a large pot of water to a boil for the ramen noodles. Cook according to package instructions, drain, and set aside.

In a separate pan, heat sesame oil over medium-high heat. Add the thinly sliced beef and sear for 2-3 minutes until browned but not fully cooked.

Add minced garlic and grated ginger; stir for 30 seconds.

Pour in beef broth and water, followed by soy sauce. Bring to a gentle simmer.

Let simmer for 5-7 minutes until flavors come together and beef is cooked through. If using bok choy or spinach, add it for the last minute of cooking.

Assemble bowls with cooked noodles, pour broth and beef over, and top with sliced green onions and a soft-boiled egg if desired. Drizzle with chili oil or sriracha for spice.