Ratanà – the home of larger-than-life chef Cesare Battisti (and some worthhile photography too)
Via Gaetano de Castillia, 28,
Fonderie Milanesi – *literally* a hidden gem (keep going through the courtyard)
Il Mercato del Duomo – giving Eataly a run for its money?
Piazza del Duomo
Also, if you are attending EXPO2015, be sure to stop by the Slow Food Pavillion. Enjoy.