Halibut Steaks Sorrento

INGREDIENTS:

1/2 lb Small mushrooms
1 1/2 c Fish stock
1/2 c Greek pitted olives (black)
4 Halibut steaks, cut into
-3/4" thick slices
Milk
Salt
Freshly ground white pepper
Flour for dredging
4 tb Sweet butter
4 tb Olive oil
3 tb Finely minced shallots
6 lg Tomatoes, peeled, seeded &
-finely chopped
1 Bouquet Garni*
1 ts Oregano
2 tb Tomato paste
3/4 lb Small mushrooms
1 Beurre Manie**
Freshly ground black pepper