Rice – Why is rice parboiled? And how does parboiling change rice

ricesticky-rice

I have recently been using raw rice at my home. I have noticed that the non-parboiled rice sticks to each other while parboiled rice does not given the same amount of cooking time.

My questions:

  1. Why is rice parboiled?
  2. How does parboiling change rice chemically?
  3. Is it possible to get (unprocessed) cooked rice not stick with each other when cooked?

Best Answer

The following excerpt answers questions 1 and 2. Additionally it reduces the cooking time for the parboiled rice.

Also known as converted rice, parboiled rice has been pressure-steamed and then dried in its natural outer husk (which is later removed). This process hardens the starch in the grains so they remain firmer, less sticky, and separate when cooked. It also forces the vitamins and minerals from the outer layer of the grains into the endosperm, which is the part we eat. This makes parboiled rice a more nutritious option than regular (unenriched) white rice, which doesn't retain any of the goodness of the nutrient-rich husk.

There are several techniques you can use to prevent unprocessed cooked rice from sticking to each other:

  • Use medium to long grain rice.
  • Rinse the rice until the rinsing water is completely clear.
  • Use the Boil and Steam method to cook the rice. In this method boil the rice for 5-10 minutes. Then pour off the excess water and steam the rice for an additional 10 minutes. This method of cooking the rice reduces the most starch on the outside of the rice which is what causes the sticking.

Source: The Science of Cooking Rice