Acai berries, called a superfood, frequently turn up in juice blends and supplements. So it's a pity that so many of us can't say the word correctly. Let's solve this: It's not ACK-ah-ee, it's not ah-KAI, and it's not ah-SIGH. It's ah-sigh-EE, with a soft "c" and a stress on the last syllable. Blame the early Portuguese explorers of Brazil, who saw indigenous rain-forest people eating a strange palm tree berry that they called in their Tupi-Guarani language ïwaca'i (something that cries or expels water). The Portuguese wrote this down as açaí.