Wtf is this?

I’m NOT here for the rice debate, I babysit this child, it is not mine, his parents will feed him how they see fit and I do the same for mine.

Anywho, I was making up some rice and saw this thing in it? It was small and brown with reddish brown dots on it. It was extremely hard. Not sure I’ve ever seen something like it before, but I never did rice with mine.