I used to find these in Brooklyn, but haven't seen them in Philadelphia. They were about 1 1/2 - 2" plain rounds. Pure pop in your mouth, 1 bite size.
Today, however, I saw Coleman on TV doing a segment on tartlets. He says they're available readymade. Anyone know where? (I really like making my own crust for tarts, but haven't the patience to make enough of these little babies for a party.)