: Cook mashed potatoes in buttermilk I heard somebody mention cooking mashed potatoes in the buttermilk instead of water. Has anybody heard of this or have a link to a recipe?

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Jack Bishop of America's Test Kitchen has a recipe for cooking potatoes in buttermilk. It is correct that the acidity of buttermilk will cause the combination to cook unevenly and can be bitter, so Bishop adds a small amount of baking soda to counter the acid. Here is a link that may be helpful www.npr.org/blogs/thesalt/2014/10/23/358101692/test-kitchen-how-to-buy-the-safest-meat-and-make-the-juiciest-steaks

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I would advise against it. Cooking in acid makes vegetables firm. Sometimes this is a good thing, but if you want to mash your potatoes afterwards, you want them soft. Else you'll get the wrong texture.

There are numerous recipes for adding dairy products to the mashed potatoes after they have been cooked and mashed, and they taste well. You can look for them, or experiment yourself. It's a matter of what taste/texture you like, there aren't any physics involved which you'd throw off with a "wrong" ratio.