Vinegar pie

Pie in American cuisine evolved over centuries from savory game pies. When sugar became more widely available, women began making simple sweet fillings with a handful of basic ingredients. By the 1920s and 1930s there was growing consensus that cookbooks needed to be updated for the modern electric kitchen. New appliances, recipes and convenience food ingredients changed the way Americans made iconic dessert pies like key lime pie, coconut cream pie and banana cream pie. During the colonial era, handmade raised pies were still being made in the colonies with traditional techniques from British recipes. Pies were adapted over generations by American women to the ingredients and culture of the United States. Harriet Beecher Stowe once wrote that pie baking "attested the boundless fertility of the feminine mind."

Source: Wikipedia