Eggplant Stacks with Tomato Jam

Quimet i Quimet is a little Ali Baba’s den of a tapas bar in Barcelona. Tiny, with every inch of wall space taken up by wine bottles, cans, and jars, it specializes in bites based on tinned gourmet products—the greatest tuna belly or anchovies ever packed in oil, boutique capers, seriously artisanal piquillo peppers. On a whim, Quim, the young owner, layers and drizzles, composing fanciful montaditos (canapés mounted on rusks) that never fail to amuse and surprise. One of his creatio