Pako (arthyrium esculentum) refers to the Philipppines "Edible Fern" which is mostly made into a salad. In the Philippines, the best Pako salad I have tasted was from Cusina ni Salud, a family-owned restaurang located in San Pablo City in Laguna. Simple, yet so delicious and healthy.

Pako, an edible fern found in the Philippines
Pako is Edible Fern in English, Philippine leafy green vegetable