Yes, it is easy to make (if you want bulgogi)
You can go to Yumi Hana just off Bahnhofstrasse and get their sliced beef (frozen).
You don't have to buy the marinade.
It is easy to do it yourselves.
I have tried a few brands of marinade and none tastes as good as the recipe here: Bulgogi Recipe
You can add chopped onions to the mixture also, if you like.
They are not hard to make. 15 min prep time, overnight marinade, and 10 minutes cooking.
If you want eat them like the Koreans, then get those mini lettuce from Migros or Coop.
Put a piece of meat on a lettuce leaf, add a bit of rice, add a tiny piece of garlic, wrap it up and shove it whole in your mouth.