Pat'S Mustard Sauce
["5 Tbsp. dry mustard", "1/2 c. sugar", "1/2 c. salt", "5 Tbsp. flour", "1 c. milk", "1 egg", "1/2 c. vinegar"]
["Sift dry ingredients and add remaining ingredients.", "Cook in double boiler about 5 minutes or until thick.", "Delicious with ham or summer sausage.", "Makes 1 1/2 cups."]
["dry mustard", "sugar", "salt", "flour", "milk", "egg", "vinegar"]