blue, you rarely find larb in a restaurants with noodles, despite what that picture shows. i actually make it with some noodle, as i love glass noodle, but it's not the standard. most of the time, it will be served on a bed of lettuce. some ignore the lettuce, but i try to get some lettuce with every bite. in can range from very salad-y to being served sans lettuce altogether. i can't think of any bitter elements in this dish. however, it's certainly sour, as a primary component is lime juice. it's one of those love-it-or-hate-it dishes i suppose. for me, i love it because of it's simplicity and sharpness. it' always a great balance (when done right) of salty, sour and hot...3 of the 5 or so primary components of most thai dish. i hope you try it again elsewhere (and make it at home!)