2-1/2 cups water
1 ounce dried porcini mushrooms
1 ounce dried shiitake mushrooms
3 tablespoons butter
1 small onion, finely chopped
1/2 pound sliced fresh mushrooms
1/2 pound sliced baby portobello mushrooms
3 garlic cloves, minced
4 cups chicken broth
1 package (6 ounces) long grain and wild rice mix
1/2 teaspoon salt
1/4 teaspoon white pepper
1/2 cup cold water
4 teaspoons cornstarch
1 cup heavy whipping cream