Slice your beef into thin slices!
Add 1 Cup water and 1 Cup Soja Sauce.
Squeeze your calamansi or lime into it and Mix it well! Steep it for about 1 Hour in the fridge. Meanwhile slice your onions. You can prepare you rice if you want to serve it with your Bistek.
Sear your meat without the marinade!
After that add the marinade and the onions and cook at middle heat for 6 minutes!
Ready! Now serve it with Rice! On the Philippines you traditional eat it with Rice. Mmmhhh masarap! That Means tasty! Enjoy it!