This past March my husband and I went out to eat at a restaurant that we normally eat. Well, to do something different, I ordered an ice tea instead of diet Pepsi. I got so sick, I was bloated and sick for a good 48 hours. I went back and asked and sure enough it was some cheap type ice tea with barley in it. Please be careful with the different teas, some do contain barley. I only use Lipton.

BamBam

I'm not sure what kind of restaurant you went to but be aware that Japanese restaurants traditionally serve barley tea especially in the summer time. It is called Mugi-cha. Mugi means barley and cha means tea.