Sinaing refers to boiled or steamed rice.
Rice is often cooked in an iron pot, traditionally in a clay pot, and these days using a electric rice-cooker.
There is a slightly lesser known meaning for the word sinaing, referring to a process of cooking fish with salt. An example is sinaing na tulingan.
HOW TO COOK RICE
Best bet would be to follow the directions on the package of the particular kind of rice you bought.
Without instructions from the packer, or access to an electric rice-cooker, you can use the following steps as a guide:
Wash 1 cup rice in cold water several times until water poured off is clear. (Filipinos tend to save the first one or two “washings” to use in particular dishes.)
Add 1 1/2 cups cold water.
Place in pot and cover.
Boil over a hot fire until the water is evaporated.
Do not stir while rice is boiling; otherwise, the rice will not stand as separate grains.
Keep warm until ready to serve, leaving the cover one.
If an electric stove is used, turn off heat and keep covered pot on burner.
If cooked on a gas stove, turn flame very low after the water has evaporated.
Once up of uncooked rice makes two cups of cooked rice.
Tagalog root word: saing