What is the action of "breaking up clumps of rice" called?

I'm really not expressing the verb well. What's the correct way to instruct

You have to "break" the rice before eating?

Solution 1:

That’s called fluffing the rice.

Here’s Bon Appetite with their rice making instructions. Note at the end where it says:

Cover the pan tightly with lid. Let rice stand, covered, for 15-20 minutes to firm up. Remove the lid and fluff cooked rice with a fork.