Barley flakes are made by husking kernels of barley, then flattening and rolling them.
The flakes look like rolled oats, but are a bit thicker and chewier. People use them most often as a hot breakfast cereal, but you can also use them in granola, puddings, baked goods or as an addition to ground meats and stuffings.
Barley flakes need about 30 minutes to cook when simmering.
When using in baked goods, some recipes will advise you to soak them first for a short while to soften them.
When added to breads, they can be added dry at the start of mixing the dough.