West Roxbury is about to gain a new Mexican fast-casual eatery when Los Amigos soft-opens either this afternoon or tomorrow. "We are hoping to have a soft opening tonight from 4-10 or tomorrow morning!" says Los Amigos via Facebook as they await a visit from the health inspector. The restaurant had hoped to open at the end of '11 and plans to serve dishes like shrimp burritos made with local ingredients. Some items will be authentic, assuming that still means something, others will feature a "contemporary twist."