This substitute requires either using fresh lemon juice or white vinegar added to milk. This particular recipe yields 1 cup of ‘buttermilk’.
The lemon/milk mixture will curdle slightly and this is what it’s supposed to do. Also keep in mind that this mixture won’t be as thick as true buttermilk, but for baking purposes, it works beautifully.
Keywords: buttermilk substitute
Find it online: https://aprettylifeinthesuburbs.com/buttermilk-substitute/