hi all - I just did some research on 'tiger nuts' or Chufa. My regular hair care product added chufa and I had to investigate!
Chufa or 'tiger nut' is actually a tuber...hard little tuber that taste nutty...nicknamed "ground almond".
There are reported cross-reactivities with some people who have oral allergy syndrome to raw veggies/fruit and pollens...but it's deemed rare.
They use chufa in horchata in Spain and make 'tiger nut milk' in some places. Popular in Africa.
Various info links:
https://en.wikipedia.org/wiki/Cyperus_esculentus (https://en.wikipedia.org/wiki/Cyperus_esculentus)
http://onlinelibrary.wiley.com/doi/10.1034/j.1398-9995.2002.23836_5.x/full (http://onlinelibrary.wiley.com/doi/10.1034/j.1398-9995.2002.23836_5.x/full) (reported reactions)
http://naturallysavvy.com/eat/tiger-nuts-are-a-great-alternative-for-those-with-nut-allergies (http://naturallysavvy.com/eat/tiger-nuts-are-a-great-alternative-for-those-with-nut-allergies) (someone's blog)
http://www.tigernuts.com/tigernuts-health/ (http://www.tigernuts.com/tigernuts-health/)
Just wanted to share...might become more common in hair products/etc. as I've seen it elsewhere over the summer in some product in CVS.