Mix the dry ingredients, then add the butter, vinegar and water; cook in double boiler over until smooth

Beat the yolks

Add the hot mixture very gradually To the yolks, stirring constantly.

Cook in double boiler until mixture thickens, stirring constantly.

When ready to serve, add a little cream or lemon juice to thin it.

NOTE: to make it with oil, beat I 1/2 cui oil with a rotary beater. It will not separate.