1 ¼cupsreserved pineapple juice and waterplus more as needed
Instructions
Cover the corn husks with hot water and soak 30 minutes, weighting them down, until pliable. Drain.
Whisk the masa harina, baking powder, cinnamon and salt in a bowl.
Beat the softened butter and sugar until light and fluffy. Beat in vanilla, then mix in the masa mixture, pineapple and 1 ¼ cups combined reserved juice and water. Add a little more liquid if needed for a soft, spreadable dough.
Spread about ¼ cup dough on the wide half of a husk, leaving a border. Fold the sides in and fold the narrow end up. Repeat to make about 16 tamales.
Set a steamer basket over simmering water. Stand the tamales upright, open ends up, above the water; cover with spare husks and a lid. Steam 1 hour 15 minutes, checking and replenishing with hot water as needed.
Let rest 15 minutes, then open one. The dough should be set and pull cleanly from the husk; if it sticks, steam 10 to 15 minutes longer and check again. Serve warm.