High-tech chocolate with flavors like truffle, saffron, or olive oil: It comes as no surprise that Oriol Balaguer used to be the head pastry chef at El Bulli. He is considered a genius among Spanish chocolatiers: eager to experiment, always searching for the next flavor kick. Kept in simple black-and-white, his elegant store on Plaça Sant Gregori Taumaturg showcases his tarts and chocolates as if they were precious stones.