Basic green sauce

Ingredients:

1 cup onions, chopped, 2 med.
1/2 cup vegetable oil
10 ounce fresh spinach, chopped
1/2 pound tomatillos, coarsely chopped
4 ounce green chile, chopped, 1 can
2 cloves garlic, crushed
1 teaspoon oregano leaves, dried
1 cup chicken broth
2 cup dairy sour cream

Preparation:

Cook and stir onions in oil in a 3-quart saucepan until tender.
Stir in remaining ingredients except broth and sour cream.
Cover and cook over medium heat for 5 minutes, stirring occasionally.
Place mixture in food processor work bowl fitted with steel blade or in a blender container. Cover and process until smooth, about 1 minute.
Return mixture to saucepan. Stir in broth.
Heat to boiling. Reduce heat. Simmer uncovered for 10 minutes.
Stir in sour cream. Cover and refrigerate any remaining sauce.