Once informed that I had certain "dietary restrictions" they had the chief come sit with me at my table in order to figure out a dish that would work for me. The chief basically told me he could make me what ever I would like within reason, and I ended up getting a vegetarian pizza with out cheese (they had no vegetarian pizza options on their menu).
My vegetarian pizza was loaded with tasty vegetables and was absolutely delicious. I was so glad that I wasn't forced to eat a small salad while my whole family ate pizza next to me. Instead I got one specially made just for me! I must say while this wasn't necessarily what one would typically call a veg-friendly restaurant it did have the best service out of all the restaurants I went to on my vacation.
For more information on Trattoria de Porto check out the Universal Orlando Site or their Menu
None - but the chief will make you something special if informed