The 'Desperation' Pie That Replaced Fresh Fruit With Vinegar - Tasting Table
Briefly

Vinegar pie might sound off-putting or at least overly savory, but stay with us. It calls for vinegar, sugar, flour, some water, some butter, and an egg. Whipped together, those humble ingredients create a fudgy, custardy consistency like a traditional chess pie. And the flavor profile, again, is similar to a lemon meringue or key lime pie, combining a complex punch of brightness with lush sweetness in every bite.
Vinegar pie achieves the effect of a pie made with citrus, but with a recipe for those times when it's not possible to get fresh fruit. It's considered a 'desperation pie' and is often linked to the Great Depression for this reason.
Vinegar pie became popular then because many people couldn't afford or access citrus fruits, but they could get a similar flavor from what they did have on hand. However, the Great Depression was not the first time vinegar pie enjoyed home-baker favor.
There's a historically defined category of pies called 'desperation pies' or 'make-do' pies. Their recipes were created to enable whipping up something delicious and satisfying from whatever's left in your pantry.
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