1. Mix flour and milk to a thick paste. Add salt. Stir in 4 egg yolks and unsalted butter. Beat egg whites with 1/4 cup sugar until stiff and fold into batter.
2. Melt 1/2 cup butter in 11-in. x 7-in. glass baking dish or a 12-in. round cast-iron pan. Pour in batter. Scatter raisins over top. Bake at 375° for 20 minutes.
3. Using two forks, tear pancake into pieces and allow to steam for a moment. Dust with confectioners' sugar and serve with plums or other fruit. Yield: 8 servings.