Pea milk, a liquid derived from yellow split peas, is the latest non-dairy milk to turn up on grocery shelves in the US. It joins hemp milk, brown rice milk and cashew drinks on the growing list of alternatives in the now-booming business of dairy alternatives. Non-dairy milk sales rose 9% in 2015 to US$1.9bn, while dairy milk sales fell 7% in 2015 to US$17.8bn; and they are expected to drop another 11% through 2020, according to a study released in April by market research firm Mintel.