Halibut with seasoning

1/2 pound mushrooms small 1 1/2 cups fish stock 1/2 cup greek olives pitted (black) * 4 each halibut steaks cut into 3/4inch slices * 1 x milk * 1 x salt * 1[...]

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[...]