What's on our plate?

Freespiral and I stopped off in Bristol on our way home to Ireland from Cornwall to visit Serpentine (Belinda) who gave us a delicious meal. Unfortunately I forgot about the blip central cultural challenge until after our plates had been licked clean but these are one of the raw ingredients. Of course the ones we ate were washed and cooked and had a mildly citrus flavour.
Now you will probably want to know what they are? Well so would we, but none of us, including Belinda can recall their name!
Anyone know?