Chicken Mole Tamales (Tamales de Pollo en Mole)

For the Batter:
2/3 cup non-hydrogenated vegetable shortening, at room temperature
2¼ cups masa harina
1 TSP baking powder
1/8 TSP salt   
2½ cups warm chicken broth

For Assembly:
Eight 8 x 8-inch prepared banana leaf squares
Eight 36-inch pieces of kitchen string for tying tamales

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