First, he changed his lunch order from tuna and toast to chicken salad on rye?
rye, barley, and sometimes wheat can figure into the grain mixture, but corn has to claim the majority.
rye whiskey has had a tough go of it, and Prohibition and two World Wars certainly didn't help.
Old English ryge, from Proto-Germanic *ruig (cf. Old Saxon roggo, Old Norse rugr, Old Frisian rogga, Middle Dutch rogghe, Old High German rocko, German Roggen), related to or from Balto-Slavic words (cf. Old Church Slavonic ruži, Russian rozh' "rye;" Lithuanian rugys "grain of rye," plural rugiai), from a European PIE root *wrughyo- "rye." Meaning "whiskey" (made from rye) first attested 1835. Rye bread attested from mid-15c.
=Rie, (Heb. kussemeth), found in Ex. 9:32; Isa. 28:25, in all of which the margins of the Authorized and of the Revised Versions have "spelt." This Hebrew word also occurs in Ezek. 4:9, where the Authorized Version has "fitches' (q.v.) and the Revised Version "spelt." This, there can be no doubt, was the Triticum spelta, a species of hard, rough-grained wheat.