Workers employed by South Korean companies at the joint Kaesong Industrial Complex in North Korea are used to getting Choco Pie chocolate treats with their lunches, but officials have apparently prevented this symbol of Southern decadence from entering the Stalinist country, the Seoul-based newspaper Chosun Ilbo reports . The chocolate-and-marshmallow snacks are popular with the North Korean workers at the complex not for their taste, but for the fact that they are worth substantial sums when sold on the black market, a trend Pyongyang is keen to stamp out.