Blame it on my northern bias, but I cannot think of a single food in the orchid family beyond vanilla (Vanilla spp.). For the largest plant family (or second largest; depending on who you ask, Asteraceae may be the largest plant family), there is a real dearth of edible species in the Orchidaceae family.
We had the pleasure to visit a sustainable, diverse, organic farm down in Belize last year – our friends there grew cacao, mahogany, teak, oranges, and other tropical goodies. One thing they were experimenting with was growing vanilla. It was trained up a tree, and sometimes “planted” midway up the tree in a little pocket of mulch.
During our visit with these folks, we got stuck for two hours in a mud pit in the orange grove, where I saw this beauty, a yet to be identified (by me) orchid, growing off the trunk of an orange tree.