Yet another whatzit

Continuing on my eat-odd-looking-yet-delicious-food trip, lunch today included this whatzit as the premier bites in the series of amuses bouches. I suppose it wouldn't hurt to tell you it's at the lovely Mugaritz. Can you tell what they were?

I'll give you another clue, they were actually a lot more traditional than you imagine. A similar taste can easily be found at any tapas bar in Spain. Speaking of which, I'll leave you to your fancy while I'm off pinching pintxos. I'm in San Sebastian after all. Click on the photo to see the rest of the meal. Ta.