MIX masa harina, lard, salt and baking powder in large bowl with wooden spoon until well blended. Gradually add just enough of the hot water to make a smooth stiff dough, stirring constantly.
ASSEMBLE tamales, using about 2 Tbsp. of the masa mixture and 1 to 2 Tbsp. of your favorite filling for each tamale.
STAND tamales in a steamer basket in large pot filled 1/4 full with water. (Make sure tamales are not touching the water.) Bring water to boil; cover. Steam 1 hour or until tamales pull away from the corn husks, adding more water to the pot when necessary. Cool slightly.