What's the plural form of stiff porridge? Here's the word you're looking for.
Answer
The noun stiff porridge can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be stiff porridge.
However, in more specific contexts, the plural form can also be stiff porridges e.g. in reference to various types of stiff porridges
or a collection of stiff porridges.