6 months baby food

My baby is 6 months and the doctor said to feed him plain porridge once a day. One week later only introduce other food such as carrot, pumpkin, potatoes added to the porridge. Can i know how do other mummies prepare porridge for their baby? I will cook it and later use a mini chopper to pureed it. But for brown rice, it will always have some “skin” of the rice which couldnt be blended.