Pick you favorite type of beef and trim all visible fat. Place the meat in the freezer for 1-2 hours to partially freeze. This allows for easier slicing and more consistent widths.
Remove beef from the freezer and slice against the grain between ⅛"-¼" thick. Add sliced beef to the container of marinade and shake well to evenly coat the meat. Marinate in the refrigerator for 6-24 hours.