Asafoetida (hing) is a spice that's often used often in Indian cuisine and it usually has gluten in it.
Some restaurant managers don't even know that and unintentionally will serve you gluten so be sure to ask them whether they use it or not.
It's true - Asafoetida (hing), a common spice in Indian cooking, nearly always contains wheat flour.
I would add this is the reason why we have the forums. It's easy enough to say, "it should be safe," but you shouldn't make statements (like some of the above comments) without checking facts first.