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    Home » Recipes » Article

    How to tell if buttermilk is bad?

    This post may contain affiliate links.

    How to tell if buttermilk is bad? Here are all the tips and signs for knowing when to use or toss buttermilk!

    goof buttermilk in a pyrex measuring cup
    Fresh buttermilk is a great addition to recipes!
    Jump to Recipe Print Recipe

    Buttermilk is a tasty addition to cakes, scones, fried chicken, dressings, and more! It lasts a long time and has been used in recipes for generations!

    What is Buttermilk?

    Current day buttermilk is fermented cultured milk. It is a thicker than milk, slightly lumpy, liquid.

    Originally buttermilk was made by beating heavy cream past the whipped cream stage, to get butter. When butter forms there is leftover liquid which is buttermilk.

    That liquid was then left out overnight to ferment naturally. Today’s buttermilk has live cultures in it to help it ferment- similar to yogurt.

    good buttermilk on spoon showing a few little lumps
    You can see the little lumps on the spoon- this is good buttermilk.

    What should buttermilk smell like?

    Buttermilk has a sharp tangy and slightly buttery smell. It should not smell super sour, but more like a mild vinegar.

    What does buttermilk do in recipes?

    The acidity from the fermentation of buttermilk helps balance out sweetness, it activates baking soda in baked goods, producing fluffy batters, and it breaks down proteins to give a softer crumb or tenderize meat.

    pouring good buttermilk into a bowl
    Good buttermilk will be thicker than milk but still pour- even if it splatters a bit!

    Can you drink buttermilk?

    Yes, people from all different cultures consider buttermilk a standalone drink. I distinctly remember my own grandmother pouring a glass or two!

    How to store Buttermilk?

    Buttermilk should be stored in the refrigerator in its original container. Before using make sure to shake thoroughly since it can separate.

    Buttermilk can be frozen buttermilk for up to 3 months. I like to freeze leftover buttermilk in cubes (using these trays- affiliate link), then store in Ziploc baggies.

    water and fat in buttermilk separated
    Here you can see the buttermilk solids and liquids have separated while it sat out.

    How to tell if buttermilk is bad?

    If buttermilk is extremely thick, coming out of the container in large lumps, and/or has a very sour smell, it is bad. There might even be some mold on the lid of the buttermilk or floating on top.

    close up of bad curdled buttermilk
    Bad buttermilk is very thick and had large chunks.

    How long is buttermilk good for?

    An opened container of buttermilk will last 14 days in the refrigerator and can last slightly longer than its expiration date.

    How long is Buttermilk good for after the expiration date?

    Buttermilk is good for about a week past its expiration date if it has been kept refrigerated. This is due to the fermentation in buttermilk allowing the buttermilk to last longer.

    Always check buttermilk for freshness even if it's not expired yet.

    thick bad buttermilk on spoon
    You can see how thick this bad buttermilk is.

    Buttermilk Substitutions?

    Powdered Buttermilk- this is a shelf stable powder that can be purchased online or at some grocery stores. Mix the powder with water and voila you have buttermilk you can use in recipes. (affiliate link)

    Milk Substitution- Simply add 1 tbs of lemon juice or vinegar to a cup of milk, let it curdle a bit, then use in place of buttermilk!

    Sometimes you just need a little bit of buttermilk and don’t want to have to buy a whole large carton- that why it’s nice to be able to use a quick substitute!

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    buttermilk recipe featured image

    How to make buttermilk substitute?

    Author: Lisa
    Sometime you just need a little bit of buttermilk and don’t want to have to buy a whole large carton- that why it’s nice to be able to use a quick substitute!
    5 from 2 votes
    Print Recipe Pin Recipe
    Prep Time 5 mins
    Total Time 5 mins
    Course Side Dish
    Cuisine American
    Servings 1 cup

    Ingredients
      

    • 1 tbs lemon juice or white vinegar
    • 1 cup milk

    Instructions
     

    • Combine milk and lemon juice. Stir and allow to sit for 5-10 minutes until it curdles slightly.
      1 tbs lemon juice or white vinegar, 1 cup milk
    • Once it is slightly thickened and lumpy use in a recipe as a 1:1 ratio for buttermilk.
      buttermilk in a pyrex measuring cup

    Nutrition

    Calories: 150kcalCarbohydrates: 12gProtein: 8gFat: 8gSaturated Fat: 5gPolyunsaturated Fat: 0.3gMonounsaturated Fat: 2gCholesterol: 29mgSodium: 93mgPotassium: 381mgFiber: 0.1gSugar: 12gVitamin A: 396IUVitamin C: 6mgCalcium: 301mgIron: 0.01mg
    Keyword how to make buttermilk, How to tell if buttermilk is bad?
    Did you make this recipe?Tag me on Instagram at @atablefullofjoy

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    1. Satin

      October 02, 2022 at 8:14 am

      Thank you for including photos in your explanation of what good and bad buttermilk looks like! They were especially helpful.

      Reply
      • Lisa

        October 03, 2022 at 12:56 pm

        Yay! So glad I could help!

        Reply

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