The difference between hulled and unhulled sesame seeds, as well as other grains and seeds, lies in the presence or absence of their outer layer, known as the seed coat.
Hulled seeds have undergone a process to remove this outer layer, resulting in a smoother texture and a lighter color. In contrast, unhulled seeds maintain their natural dark color and have a rougher texture due to the retention of the seed coat.
Unhulled sesame seeds, for example, are often used in the production of sesame oil and specific culinary dishes. They are considered to be more nutritious compared to hulled seeds because the seed coat contains a significant amount of valuable nutrients. However, it's important to consume unhulled seeds in moderation due to their dense nutrient content.