Halibut with ribs

3 tablespoons corn oil 3 garlic cloves , minced 1 large onion , roughly chopped 2 carrots , roughly chopped 2 potatoes , peeled and roughly chopped 2 parsnips[...]

1 tablespoon olive oil 3/4 lb carrot , cut in 1/4 inch dice 1 cup chopped leek 1 cup chopped onion 4 celery ribs , cut in 1/4 inch dice 6 ounces arugula or 6[...]