Easiest way to get started with Korean food, try this Korean-style BBQ beef also known as bulgogi 불고기. With only few basic ingredients you can easily make this at home. Use cast iron skillet for those char bit wonders.
Slice meat thinly as you can. Refer to my post above on how to do it in an easier way.
Marinade
Add all of marinade sauce ingredients into a wide container and mix well.
Add in sliced meat and coat well with the marinade.
Cut and separate the green part of spring onion from the white. Cut the green part into 2 inch (5 cm). Cut the white part thin. Add them into the container and mix well.
Cover and chill in the fridge for 1 hour. You can also leave it overnight.
Using tongs, add marinated meat (leave out the marinated liquid) and onion. Cook in small batches. Once the meat is looking golden brown with char marks, flip and continue cooking. Move around in the skillet to soak up the flavor.
Notes
Serve hot with some rice, perilla leaves, or lettuce with some kimchi on the side.