This porridge is reminiscent of a cream of grain cereal, but much more adventurous. It could be made with any type of sourdough starter – wheat, rye, or gluten-free. Any grain used will impart its own flavor and texture, as well as the flavor of the sourdough starter itself, so a neglected starter shouldn’t be used for this.
For a less tangy flavor, omit 2 cups of the starter and replace with 1 cup each water and flour or coarse grain. Leave to sour overnight or cook immediately with the same ingredients and instructions as the original recipe.