Clean tomatillos, then boil them in 2 cups of water for 20 minutes.
Drain and puree in blender with 1/2 cup water and onion, garlic,
chiles and cilantro leaves. Pour into a bowl. Add sugar.
Over low heat, in a mixture of hot butter and vegetable oil, lightly
brown the pumpkin seeds, shaking the pan often and stirring constantly
to prevent seeds from scorching. Place seeds in blender container
and add 1 cup of chicken stock or water. Puree until thick and creamy.
Heat lard in a Dutch oven and pour in the prepared tomatillo sauce.
Stir in the pumpkin seed sauce and mix well. Simmer over medium
heat for 3 minutes.
Taste for seasoning, and adjust if necessary.
Add chicken bouillon granules and stir well. Cook 2 minutes more.
To use, arrange cooked chicken pieces in a casserole. Pour the sauce
over the chicken and bake, covered, at 325 degrees F until heated