Everyone knows about places like this�the cupboard-sized, no-frills, somewhat cryptic ethnic joint next to the Plaid Pantry. "They say it's good," you might remark. Or, "Huh, that's the place my buddy Trev goes for $2 sandwiches." Well, wonder no more, intrepid eaters: This tiny outlet for Vietnamese bahn mi is a hidden gem. Dirt-cheap (multi-meat sandwiches made with big crusty loves of fresh French bread run from $2.50 to $3.50), cheerful despite its mini-strip-mall location and staffed by very friendly, competent kids, Cali should remain a mysterious secret of Portland food lore no more. (ZD)