To substitute shortening with oil is a 3 (oil) to 4 (shortening) ratio. Since the recipe asks for 3/4 cup shortening you will need 1/2 cup plus 1 tablespoon of oil. Please note that using oil instead of the shortening called for in a recipe in baking items such as cakes, cookies or pastries will cause the items to be more dense (less fluffy).
I believe they would substitute the same, as far as measure; BUT you won't necessarily get the same result with whatever you're cooking! Certainly worth a try, unless you need to be sure your food comes out PERFECT for some reason. If you're baking, it might be flat or otherwise wonky...
How much oil do you use for 1 cup of shortening?
By Linda from Carl Junction, MO
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