Following 3 years excavating an ancient landfill in the City of David, Tel Aviv University has published that 2nd Temple Jerusalemites kept kosher. They dined primarily on sheep and goats, with much fewer cows and chickens. They ate plenty of fruit and vegetables, but no pork or shellfish.

http://www.jpost.com/Israel-News/Jerusalem-excavation-reveals-diet-of-ancient-Israelites-during-Second-Temple-period-494148