Can you believe this BBQ sandwich is all fruit?

Smothered in Carolina barbecue sauce and topped with bread-and-butter pickles, slaw, shallots and horseradish aioli, this barbecue sandwich is all the rage at Brooklyn’s Smorgasburg food market. But in place of juicy pulled pork, the star ingredient is jackfruit: the healthy Southeast Asian produce that has about 17 calories per ounce — putting a big...