The origin of fried green tomatoes is a bit of a culinary mystery, as different sources attribute it's origins to various regions and cultural traditions.
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Southern United States: Fried green tomatoes are widely associated with Southern cuisine, largely due to the 1991 movie Fried Green Tomatoes, which was based on Fannie Flagg's novel Fried Green Tomatoes at the Whistle Stop Cafe. This has led many to believe that the dish is a traditional Southern staple. However, evidence suggests that it may not have been a widespread Southern dish until more recent times.
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Jewish Immigrants: Food historians believe that fried green tomatoes may have actually originated in the North, particularly among Jewish immigrants. Recipes for fried green tomatoes appeared in Jewish cookbooks in the Northeastern United States as early as the 19th century. It is possible that Jewish immigrants brought the dish with them and adapted it to the ingredients available in the U.S.
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Midwestern United States: Another theory is that fried green tomatoes became popular in the Midwest, where farmers looked for ways to use up the last of their unripened tomatoes at the end of the growing season. This practical use of green tomatoes may have eventually spread to other regions.
Green tomatoes were used in culinary dishes because once a tomato freezes, it is unpalatable and inedible. Before refrigeration, tomatoes were used fresh and everything that could be harvested before frost was utilized. Unripe green tomatoes found their way into some tasty recipes which you can read more of HERE.
In summary, while fried green tomatoes are often thought of as a Southern dish, their true origins are more likely tied to Northern and Midwestern regions, particularly among Jewish communities. Over time, the dish has become a beloved part of Southern cuisine as well.