Dave Fun Quiz: Food and Drink Wordplay

I've been going to a lot of health food stores recently, and I noticed the following fact: if you take the names of two grains commonly found in health food stores, combine them, and rearrange the letters, you can spell the name of a liqueur common to many mixed drinks. What are the words?

UPDATE: As you might expect, the answers are in the comments. So consider this a spoiler alert.