Asafoetida (hing), a common spice in Indian cooking, nearly always contains wheat flour.Asafoetida is a powder made of dried gum of a root called ferula. It is known for its unpleasant smell and its delicious oniony, garlicky flavor. It is an important part of many Indian dishes. Although the powder is naturally gluten-free, it is almost always manufactured by diluting it significantly with wheat flour.The only American company making a verifiably gluten-free asafoetida is Frontier Naturals, which makes an asafoetida powder that is cut with rice flour instead. When eating at Indian restaurants, be sure to ask if asafoetida (often referred to as hing) was used in the preparation of your meal.