Turkey Tetrazzini Al Forno

Name: Turkey Tetrazzini Al Forno
Ingredients: 2 T. butter; 1/2 red pepper; 1/2 lb. Cremini mushrooms; 4 cups leftover turkey meat, white and dark, pulled apart into bite-sized pieces; 6 T. turkey fat; 4 T. flour; 2 cups turkey stock; 1 pint half and half; 1 cup dry sherry; 1 c. grated Parmigiano-Reggiano cheese, plus some extra for the topping; 1 lb. good pasta; 1 package frozen baby peas; 1/4 cup bread crumbs; 1/4 cup slivered almonds; Salt and pepper to be added judiciously throughout the preparations