Ottolenghi - London
With four locations in London, Ottolenghi offers fresh and beautiful ready made food and pastries. Just walk in and you'll be blown away by the overflowing salads and ridiculous sweet looking treats. The staff loads up a box for you, after which is weighed. Be sure to keep an eye on how much you are actually getting, it can add up quickly. I may have dropped a good 20 pounds on lunch.
And as good as the salads are, the desserts are better. The lemon blueberry cupcake was one of the best I've had. Same goes for the chocolate chip cookie. The brownie, so gooey with big hazelnuts baked inside. Not all the locations have seating, so find a park nearby.
They've also opened a restaurant called Nopi which is said to be great. Let me know if you go.