Pickled herring casserole - Astray Recipes

Ingredients

• 1 tablespoon Butter
• 1 cup Fine dried bread crumbs
• 1 tablespoon Finely chopped fresh parsley leaves
• 2 ounces Grated Parmigiano-Reggiano cheese
• Salt
• Freshly ground black pepper
• 1 pounds Idaho potatoes; peeled and sliced ; 1/4-inch thick
• 2 cups Thinly sliced onions
• 2 tablespoons Flour
• 6 Pickled herring
• 1½ cup Milk