I went to Rocket last year while visiting London (various locations, I was at the Old Broad Street location) and I highly recommend it. Everything I tried was delicious, and was made with, well...rocket, although I don't think every menu item contains the leafy wonder. I love the taste so it was a natural for me. Heading back again in a couple of weeks and will be dining there again. Galvin La Chapelle has also been recommended to me so reservations have been made.