1 1/4 pounds oyster, (or shiitake or cremini mushrooms), cleaned, any clusters separated
2 tablespoons white wine
1 1/4 pounds fresh or frozen spinach, chopped
For the Rockefeller Sauce:
1/2 small (about 3/4 cup) fennel bulb
1/2 package (12.3oz.) firm lite silken tofu
1 1/2 tablespoons white wine or champagne vinegar
1/4 teaspoon dry mustard powder
1 1/2 teaspoons Dijon mustard
1 tablespoon ground anise seeds or ground fennel seeds or ground star anise
2 cloves garlic, peeled
1/4 teaspoon freshly ground black pepper