The Gusto restaurant inside Sutterlüty's Egg market: hot menus cooked fresh every day, a hot counter, breakfast from early morning, and everything also to take away. One of the daily menus is always vegetarian.
Vegetarian is on the menu, but the same kitchen also prepares what you avoid, so cross-contamination is possible. Tell staff what you react to, and ask how your dish is prepared before you order.