Butternut Squash With Pistou without vanilla hazelnut

1 tablespoon butter 1 tablespoon olive oil 2 large onions , chopped into 1-inch squares (about 4 cups) 3 tablespoons fresh sage , chopped or 1 tablespoon[...]

4 -5 cups butternut squash, cubed (about 1 1/2 inch cubes) 1 medium carrot , chopped 1 medium yellow onion (1/2 chopped and 1/2 sliced) 2 stalks celery ,[...]