Prepare Corn Husks: Rinse corn husks, soak them in warm water for 2+ hours, and pat dry before use.
Cook Pork: Trim fat, cut into chunks, and pressure-cook with seasonings for 90 minutes. Shred pork and mix with some broth.
Make Chili Sauce: Boil ancho and guajillo chilies with onion and garlic. Blend and strain into a smooth puree. Mix some sauce into the shredded pork.
Prepare Masa Dough: Beat lard until fluffy, then mix with pork broth, chili sauce, and masa harina until smooth and spreadable. Test by dropping dough in water—it should float.
Sort Corn Husks: Separate husks into “usable” for wrapping and “unusable” for ties.
Assemble Tamales: Spread masa on a husk, add pork filling, fold, and tie with strips.
Load Steamer: Stand tamales upright in the steamer basket, open ends up.
Steam Tamales: Cook for 35 minutes in the Instant Pot on High Pressure.
Cool Tamales: Let them rest for 15 minutes before serving.
Serve: Unwrap and enjoy with chili sauce, sour cream, and your favorite sides!