Rolled oats
Rolled oats are a type of lightly processed whole-grain food. They are made from oat groats that have been dehusked and steamed, before being rolled into flat flakes under heavy rollers and then stabilized by being lightly toasted.
Thick-rolled oats, or old-fashioned oats, usually remain unbroken during processing. Rolled whole oats, without further processing, can be cooked into a porridge and eaten as oatmeal; when the oats are rolled thinner and steam-cooked more in the factory, these thin-rolled oats often become fragmented but they later will absorb water more easily and cook faster into a porridge; when processed this way, they sometimes are marketed as "quick" or "instant" oats.
Rolled oats are most often the main ingredient in granola and muesli. They can be processed further into a coarse powder, which breaks down to nearly a liquid consistency when boiled. Cooked oatmeal powder is often used as baby food.
Process
The oat, like other cereals, has a hard, inedible outer husk that must be removed before the grain can be eaten. After the outer husk has been removed from the still bran-covered oat grains, the remainder is called oat groats. Since the bran layer, though nutritious, makes the grains tougher to chew and contains an enzyme that can cause the oats to go rancid, raw oat groats are often further steam-treated to soften them for a quicker cooking time and to denature the enzymes for a longer shelf life.Steel-cut oats are oat groats that have been chopped by a sharp-bladed machine before any steaming, and thus retain bits of the bran layer.
Preparation
Rolled oats can be eaten without further heating or cooking, if they are soaked for one to six hours in water-based liquid, such as water, milk, or plant-based dairy substitutes. The required soaking duration depends on shape, size and pre-processing technique.Whole oat groats can be cooked as a breakfast cereal in the same general way as the various forms of oatmeal, rolled oats, and pinhead oats; they simply take longer to cook. Rolled oats are used in granola, muesli, oatcakes, and flapjacks.