2 hours ago, Anna N said:
Those peas are really calling out to me. I had to look up Sirene cheese and it seems to me that feta it would be a very appropriate substitute?
They are very similar. I'd look for a very soft feta, not crumbly but just breakable, it should be almost spreadable. Flavor wise, look for something milky and not briney, best if it has some aged cheese flavor. It should not be too salty.
As for the salad as a whole, don't skimp on the mint, and serve at room temperature (I think that peas gets strange texture when cold).