To prepare a individual yorkshire puddings with rare roast beef recipe, preheat the oven to 180oC/350oF. Place the flour, baking powder, salt and nutmeg in the bowl of an electric mixer fitted with the whisk attachment. Add the milk and beat until the mixture is light and fluffy, about 5 minutes. Gradually add the egg, beating well after each addition. Pour the batter into the greased and floured muffin tin. Bake for 20 to 25 minutes or until browned. Serve warm.