Pumpkin Soup with bay

1 tablespoon extra virgin olive oil 2 tablespoons butter 1 fresh bay leaf 2 stalks celery & leaves , finely chopped 1 medium yellow onion , finely chopped[...]

1 medium onion , chopped 2 teaspoons butter 2 cups fresh pumpkin puree (I prefer to make the mashed pumpkin myself, but you can use canned if you like) 4 cups[...]