We were looking for a vegetarian lunch and this deli has a great selection of freshly made items in their chill cabinet. You can have a mixed plate selection for about 10 euros. Either choosing exactly what you want or leaving the selection to them. Seating inside or take-away. Make sure you ask for a vegetarian platter but also make it clear you don't want meat or fish items. They also serve a big selection of non-veggie items, so might not immediately appreciate the vegetarian thing.
Via B. Colleoni, 26. On the main shopping street in the old town - opposite a restaurant owned by the same people.
Google map: bit.ly/b3AgP8
Great food - and we are vegetarian. And if you want a takeaway or supplies for breakfast, just pop next door to the excellent Papaya health-food shop.