Parboil sweetbread, cool, and cut in small pieces; there should be one cup. Melt two tablespoons butter, add two tablespoons flour, and pour on gradually one-half cup chicken stock; then add two tablespoons heavy cream, and one-third cup mushroom caps broken in small pieces. Season with salt, paprika, and Worcestershire Sauce. Cut a slice from stem end of six peppers, remove seeds, and parboil peppers five minutes. Cool, fill, cover with buttered crumbs, and bake until crumbs are brown. Break stems of mushrooms, cover with cold water, and cook slowly twenty minutes. Melt two tablespoons butter, add a few drops onion juice, two tablespoons flour, and pour on gradually the water drained from mushroom stems, and enough chicken stock to make one cup. Add one-fourth cup heavy cream, and season with salt and paprika. Pour sauce around peppers. When parboiling peppers add one-fourth teaspoon soda to water.