Instructions: In top of double boiler combine whites, sugar, corn syrup or cream of tartar, water, and salt but do not place over boiling water. Beat 30 seconds at low speed of electric mixer. Place over boiling water.

Cook, beating constantly, until stiff peaks form (about 7 minutes). Dont overcook. Remove from boiling water. Add vanilla, beat until spreading consistency, about 2 minutes. Frosts 2 8- or 9-inch cake layers.

Chocolate option: fold in 2 ounces melted and cooled unsweetened chocolate, just before frosting cake.

Alternately, one could also substitute pareve margarine for the butter in a buttercream, but I dont know how that affects the taste.

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