Ooh, architectural and tasty! I made pasta puttanesca for dinner tonight (a husband and daughter favorite) and this was an excellent accompaniment. As liamsaunt said, this could easily be a light dinner itself-- a good thing, as I am getting tired of pasta puttanesca (c.f. husband and daughter favorite, above). We are just getting good tomatoes, so these are probably not heirloom-- but, being among the first, they are certainly treasured.
My stack came out very tall, so I had to demolish it before eating-- lots of fun. Since I was making puttanesca sauce, I added some capers and garlic to the dressing for extra zing. Despite the heavy shadow, I like this photograph because it looks like the capers on the right side of the top tomato slice are about to jump off, lemming-like, onto the plate. Whee!