MEXICO CITY — Even though it's illegal, bars of acitrón are stacked in nearly every stall at the Merced market in Mexico City. They look like lemon bars. But they're pieces of barrel cactus that have ...

Endangered barrel cactuses known as biznaga are seen growing inside the botanical gardens of the National Autonomous University of Mexico in Mexico City. (Rebecca Blackwell | AP) MEXICO CITY — Even ...

Rebecca Blackwell / AP Even though it’s illegal, bars of acitrón are stacked in nearly every stall at the Merced market in Mexico City. They look like lemon bars. But they’re pieces of barrel cactus ...

In Mexico, September means chiles en nogada season. But one key ingredient, a candied barrel cactus called biznaga, is now ...