1 tablespoon shortening
1 cup whole milk
1 tablespoon butter, melted
1 cup all-purpose flour
1/2 teaspoon salt
Using 1/2 teaspoon shortening for each cup, grease the bottom and sides of six 6-oz. custard cups or the cups of popover pan. If using custard cups, place on a 15-in. x 10-in. x 1-in. baking pan.
In a small bowl, beat eggs; blend in milk and butter. Beat in flour and salt until smooth (do not overbeat).
Fill cups half full.
Bake at 450° for 15 minutes. Reduce heat to 350°; bake 30 minutes longer or until very firm.
Remove from the oven and prick each popover to allow steam to escape.