Porridge is plain, warm and patient food. Dream books read it as simple care and steady beginnings; a thin gruel can stand for feeling that you are getting by on too little.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.