Buckwheat kernels that have been hulled. When the groats are roasted, they are known as kasha, which is a staple in Eastern Europe (especially Russia). Roasted buckwheat groats have a darker color and a stronger flavor than unroasted groats. Both roasted and unroasted groats are available commercially. It is often beneficial to buy unroasted buckwheat groats and then toast the kernels yourself. Home roasting provides a fresher flavor and the degree of roasting can be controlled.
Hot Liquid Cooking Techniques for Grain | Cooking Buckwheat
The three basic techniques for cooking buckwheat with hot liquid are boiling, absorption, and steaming, which are perhaps the most popular methods for cooking most whole grains.