Beat butter in a large bowl with an electric mixer until creamy. Add salt and continue beating for a few minutes. Add masa harina and beat well until combined. Add chicken broth, beating until masa has a smooth and workable consistency similar to cookie dough.
Combine jalapeno, garlic, salt, pepper, and oregano in a blender; blend until smooth with a little oil if needed. Mix in with ground pork.
Spread 2 to 3 tablespoons masa mixture onto 1 banana leaf, filling it up to 2 inches from the bottom and 1/4 inch from the top. Add 1 tablespoon of the pork filling in the center of the masa mixture. Fold sides of banana leaf together, one over the other. Fold the bottom of the banana leaf over the seam of the 2 folded sides and tie together with kitchen string. Repeat with remaining banana leaves.
Place a steamer insert into a saucepan and fill with water to just below the bottom of the steamer. Bring water to a boil. Add tamales with the open side up and cook until filling is heated through and separates from the leaf, 1 hour 30 minutes to 2 hours. Let tamales rest for 15 minutes before serving.
Beat butter in a large bowl with an electric mixer until creamy. Add salt and continue beating for a few minutes. Add masa harina and beat well until combined. Add chicken broth, beating until masa has a smooth and workable consistency similar to cookie dough.
Combine jalapeno, garlic, salt, pepper, and oregano in a blender; blend until smooth with a little oil if needed. Mix in with ground pork.
Spread 2 to 3 tablespoons masa mixture onto 1 banana leaf, filling it up to 2 inches from the bottom and 1/4 inch from the top. Add 1 tablespoon of the pork filling in the center of the masa mixture. Fold sides of banana leaf together, one over the other. Fold the bottom of the banana leaf over the seam of the 2 folded sides and tie together with kitchen string. Repeat with remaining banana leaves.
Place a steamer insert into a saucepan and fill with water to just below the bottom of the steamer. Bring water to a boil. Add tamales with the open side up and cook until filling is heated through and separates from the leaf, 1 hour 30 minutes to 2 hours. Let tamales rest for 15 minutes before serving.