This is our family recipe for Congee, chinese rice porridge. You can start off with just rice and then build up to adding sweet potato, chicken, carrots, broccoli, barley etc. You can firm up the texture as your baby starts to learn how to chew.
Take half of a cup (or measuring unit of your choice, it's the ratio that's importatn) rice, Thai fragrant for example NOT easy cook or basmati and wash it in three changes of cold water.
Put it in a small pan and cover it with 2 and a half cups of water (or five times as much water) and bring it very slowly to the boil.
Simmer it for 30 minutes stirring occasionally to prevent sticking.
The grains should have swelled and become mushy and it should look like wallpaper paste. Allow to cool and then blend/puree for weaning purposes, or leave as it is for older babies.
It can be frozen in cubes and microwaved or steamed on a dish to serve.
I would recommend cooking with half homemade chicken stock once you are ready to start introducing meat to your baby
HTH