Make this recipe a recipe that people in that category can eat. categories: ['dairy_free'], recipe: stir butter and flour together. add milk and let cook in top of double boile, stirring constantly, until quite thick. separate eggs and beat the egg whites until stiff. beat egg yolks slightly, and add the salt, cayenne pepper, sugar, mustard, and vinegar then stir into the thickened milk mixture. cook until thick like cream. remove from heat and pour into the egg whites, stirring constantly.

Target recipe: place sugar, flour, dry mustard, salt, and pepper in the top of double boiler. blend in 1 cup water until thoroughly mixed. place over direct heat and bring to a boil, stirring constantly but gently. cook 1-2 minutes longer after mixture comes to a boil. stir in vinegar. beat the egg yolks slightly then stir 3 tablespoons of the hot mixture into the eggs. beat vigorously. immediately blend the egg mixture into the mixture in the top of the double boiler. place over simmering water and cook 3-5 minutes. stir slowly to keep mixture cooking evenly. remove from heat and stir in margarine. cool and store in refrigerator in tightly covered jar. before using, thin to desired consistency with cream, fruit juice or vinegar.