If you are not familiar with couscous, it is because it's mostly found in many Middle Eastern and Mediterranean cuisines. Fortunately if you are following a gluten-free diet, couscous is not for you. Unless it's made with a gluten-free couscous product. If you do find gluten-free couscous, follow the cooking instructions per the instructions on the box how to cook it, since gluten-free products can be tricky to achieve the well-cooked outcome that you want. The type of couscous used in this soup is pearl couscous. It is a type of pasta made from wheat flour and semolina, with the size and look of small pearls. We don't eat a lot of pasta in our house, I think probably because of the texture of it, but from all the pastas out there, couscous is our favorite. Maybe because it doesn't really taste or feel like pasta. Couscous is rich in selenium and and helps lower your risk of cancer, while spinach provides you with vitamins K, A, C, as well as folate.