Vinegar Pie
["1 c. sugar", "4 Tbsp. flour", "2 egg yolks", "1 Tbsp. lemon extract", "1 c. hot water", "4 Tbsp. vinegar"]
["Sift flour and sugar together.", "Add vinegar, egg yolks and lemon, then hot water.", "Cook and stir until it boils.", "Put in baked pie shell.", "Top with meringue."]
["sugar", "flour", "egg yolks", "lemon extract", "water", "vinegar"]