Vitrine is located on the fourth floor of the St. Regis Hotel (125 3rd Street) and has a nice, airy feel. I'm always looking for a nice lunch place in SF since many of the higher-end restaurants tend to have only dinner service. Vitrine, on the other hand, is only open for breakfast and lunch/brunch (one can go to Ame on the ground floor, which is only open for dinner). The lunch menu changes daily, but the one thing they always have is their Organic Beef Burger, which came highly recommended.
After starting with a light salad, I decided that I have to try the burger, which one could get with or without a fried egg on top. I opted to get it with the fried egg, which I knew was going to get messy, but hey, as long as the food is good I don't mind a little mess. The burger came with all the usual fixings, including lettuce, tomato, cheese, onion, and pickle. It also came with fried potato chips, which is Vitrine's version of french fries. The burger was juicy and the fried egg added a different texture. It was a good burger but not quite a "I must come back and have it again soon" burger. My companion got a seared tuna salad, which was beautifully presented and she said it was quite flavorful. Overall, Vitrine delivers solid food and has potential to be a good lunch spot, but the restaurant may have a tough time expanding their clientele beyond hotel guests since there are many other options in the area.