I have been here a couple of times with family. It's a very small place (as others have noted) but cosy and nicely decorated in a bohemian kind of way. However the size does mean that you can't always get a table, or may have to share one.
Food wise there is an extensive menu which caters very well for vegans, and features burgers, sandwiches and salads for lunch as well as specials on the blackboard (such as soup of the day). Portions are generous, for example I've had the vegan 'blow out' sandwich which consisted of thick slices of granary bread, vegan sausage, avocado, houmous, chutney and salad - delicious and very filling!
Moroccan sweet mint tea is also served complete with a traditional silver pot and colourful glasses, something I've had both times and really enjoyed.
A couple of reviewers have mentioned the attitude of the boss, and I have found her to have somewhat of a brusque manner at times but she was not rude to us. A member of my family said that she would rather someone be real than fake even if this means they are not as warm and fuzzy as one would expect in the hospitality industry, and I tend to agree.
Pea Souk may be quirky and not to everyone's taste but for such a small space there is a lot of variety and interest in the food, and the owner has created a nice environment. The only criticism I have is that the food preparation area looked quite chaotic and one of the avocados in my sandwich had some bruised flesh that I had to remove - not something that would bother everyone.
As I've only been for lunch I can't comment on any evening meals that may be available.Pros: tasty food, generous portions, attractively decorated
Cons: bruised avocado