Twice a week Rupert's Street park up near to where I work, and every time I have eaten their food I have loved it. Wholesome and satisfying home-made style food. Recently had their beetroot and chickpea burger, served with a healthy salad, and their spicy bean balls with tomato sauce, and both served with kale, so they're making sure you stay healthy ;). Also tried their oat slice made with coconut oil which was delicious (slightly crumbly though, but my taste buds forgave that). You can also find them at various festivals and they do catering. The owner is very friendly and will probably remember you on your second visit and strike up a bit of friendly banter. Their ethics and approach are great too with regards to local/organic produce, supplier traceability, packaging etc, this is how things should be. Price is very reasonable for the quality and portions you get.
Cons: Not always near to me