I wish I had some good news. Alas, I checked with a number of pizzerias and none seem to have it. It would seem an easy thing to get some chopped clams and put them on top with some garlic. Maybe what you should do is suggest it to your favorite pizzeria if you’re a regular customer. And then let me know so I can write it up (that assumes that you like it). BTW, thanks for your suggestion about Bali restaurant downtown. Delicious and cheap!