Boiled Mayonnaise

One cup water, 1/4 cup vinegar, 1 cup mazola, 1 egg yolk, 1 teaspoonful salt, 1/2 teaspoonful mustard, 1/2 teaspoonful sugar, 2 tablespoonfuls oil and 2 tablespoonfuls flour. Boil water and vinegar and stir in oil and flour, rubbed together. Stir and cook 5 minutes. Remove from fire and pour over beaten egg yolk and stir well. When cooled add cup of oil slowly and beat all the while with egg beater. Mix salt, sugar and mustard together. Add and stir into dressing.