Oats taken from the farmer’s field are sieved in a rotating drum to remove impurities like seeds, stalks, sticks, and stones. Then they are put into a rotating drum to remove the husk. Finally, the oats are heat dried to reduce the moisture content before being ground or crushed to produce fine oatmeal.
Oatmeal is a product made by processing oats. In North
America, oatmeal means any crushed oats, rolled oats, or cut oats
used in recipes such as oatmeal cookies. It is also a name for a
breakfast cereal made by cooking the oats. All oatmeal is porridge,
but not all porridge is oatmeal.
Porridge made from oatmeal is also called oatmeal or oatmeal
cereal. Porridge can be made with oats, rice, barley, cornmeal,
brown rice, or basically any grain that is cooked, usually in water
or milk. Similar dishes made with other grains or legumes often have
other names, such as groat, polenta, grits, owsianka, or kasha.
Since porridge was used as prison food for inmates in the British
prison system, 'doing porridge' became a slang term for a sentence
Gruel is similar to porridge, but is made without milk and
has a very thin consistency.
A spurtle is a Scottish kitchen tool used for stirring porridge.
Bonus - Pease porridge made from dried peas is another
traditional English and Scottish porridge. It inspired the Mother
Goose rhyme "pease porridge hot, pease porridge cold, pease
porridge in the pot, nine days old.