My list may be biased based on my taste. Here are my top food stalls in the Philippines, most of them are located in Metro Manila.
1.) Turks
I specifically love the spicy chicken shawarma with cheese.

2.) The Authentic Maranao Dish
As I have many Maranao friends after taking classes on Islamic Philosophy in University of the Philippines- Diliman, I have learned to love their spicy foods. This stall is located in Greenhills Shopping Center.
3.) Potato Corner