In a bowl beat 2 cups warm water into masa harina to make a stiff, smooth dough. In a large bowl, beat lard with electric mixer or wooden spoon until light and fluffy. Begin adding masa, a handful at a time, beating constantly. When all masa is incorporated, beat in onions and season to taste with chili powder, cumin, salt and pepper.
Yield: enough dough to make 25 Tamales