I've had beef bulgogi many times, but the version at this place was the most authentic I've ever had. If you've ever had authentic Asian cuisine versus the Americanized version, you know how getting to the origin of a dish's ingredients can make a world of differences.
Of course, you could buy a bottle of premade bulgogi sauce filled with ingredients you can't pronounce and loaded with GMOs and MSG, but what's the fun in that?
Also, starting from scratch is always better. You took the time to go out and hunt and harvest a big game animal, so why cut corners in this process? Trust me, it's worth it. This dish is served best with steamed white rice, charred scallions and kimchi.