UPDATED: There is already a winner–OCLibrarian–but that person hasn't claimed the prize. If it's not claimed by 8 p.m. tonight, first person to type in the answer wins!
ORIGINAL POST: Split-open bratwurst with kraut? YUMMMMM . . . but I didn't eat this at a German-themed restaurant (your only clue for the moment). Gentle readers: Where did I eat this? First person to guess correctly wins a prize! One guess per comment; Weeklings are ineligible!