Soak the corn husks in a bowl of warm water for at least 30 minutes to soften them.
In a mixing bowl, combine the masa harina, baking powder, and salt.
In a separate bowl, cream the vegetable shortening until light and fluffy.
Gradually add the masa harina mixture to the creamed shortening, alternating with chicken broth, and mix until smooth.
In a skillet, mix the shredded pork with red chili sauce and cumin. Taste and adjust seasoning as needed.
To assemble the tamales, take a soaked corn husk, spread about ΒΌ cup of masa dough in the center, and add a spoonful of pork filling.
Fold the sides of the corn husk towards the center, then fold the bottom up to secure the filling. Repeat until all tamales are assembled.
Set up your steamer pot with water, bring it to a boil, and place the tamales upright in the steamer basket with the open ends facing up.
Cover the tamales with a wet cloth or additional corn husks and steam for about 90 minutes.
Remove tamales from the steamer and let cool for a few minutes before serving.