Oil Dressing

Four level tablespoonfuls flour, 1 teaspoonful salt, 1/2 teaspoonful mustard, little paprika, 2 tablespoonfuls oil. Mix into a paste, add 1 cup boiling water and cook 3 minutes; pour over beaten yolk of 2 eggs; let cool; add 1/4 teaspoonful acid, lemon juice or vinegar, 1 cup oil. Beat in slowly. Use egg beater.