Pálffy Noodles

Name: Pálffy Noodles (Pálffy Metélt)
Cuisine: Hungary
Ingredients: ¼ cup ground walnuts; 1 tablespoon lemon juice; ½ cup sugar; 5 sour apples, peeled, halved and cored; ¼ cup bread crumbs; Butter for greasing pan; 1 quart milk; 2-inch piece of vanilla bean; 6 tablespoons sweet butter; Rind of ½ lemon; 1 cup flour; 5 eggs; Salt