How to Use Leftover Whey From Making Cheese or Greek Yogurt

Whey is the natural by product of straining dairy. It’s what you get if you make cheese or Greek yogurt. So what can you do with leftover whey? Well, don’t just pour it down the drain! There’s loads of different ways to use up whey.

All About Leftover Whey

Whey is essentially water, lactose and whey proteins. The flavour and sourness varies depending on the type of cheese/yogurt you made.

1. Sour whey comes from cheese made using citric acid or vinegar. It has a high acidity, high lactose and will not continue to ferment as it ages.
2. Sweet whey is made from cultured dairy. It will taste sweet for the first 3 hours after draining. After that it will become more acidic as the lactose is consumed by the lactobacteria. Storing sweet whey in the fridge will help slow the acidification, but only for a short time. Sweet whey is probiotic and lower in lactose.

Here are some of my favourite ways to use up extra whey.

1. Hot chocolate

Fresh sweet whey from cheesemaking is actually very sweet. I like to drink it straight or turn it into something yummy like hot chocolate, chai tea latte or ovaltine.  Fresh whey is really only sweet for the first few hours, so take a break from cleaning the kitchen and enjoy a hot beverage while your cheese finishes draining.

2. Culturing

Sweet whey is full of lactobacteria. It is perfect for fermenting all sorts of things. Most grains, legumes, nuts and vegetables can use sweet whey as a starter. This won’t work for acid whey because it doesn’t have the bacterial culture.

3. Soups and Stews

One of the best ways to use up leftover whey is as a base for soup. Replace the broth or water in a recipe with whey at a 1:1 ratio. It adds a richness and tanginess that really brings out the flavours of the other ingredients.

Here are a few recipes that were designed to use up leftover whey:

• Creamy whey and vegetable soup
• Traditional whey minestrone
• Indian paneer and whey soup
• Iranian whey and walnut soup

4. Baking

Leftover whey is perfect for any recipe that calls for buttermilk. It’s not as thick as buttermilk, but it certainly works to balance the acids in the batter.

Here are a few baked goods that are perfect for whey:

• Buttermilk muffins
• Apple Coffee Cake
• Soda bread
• Cornbread
• Pancakes
• Buttermilk waffles
• Red Velvet cake

You can also use whey instead of water in any quick-rise yeasted bread recipe. It will add a delicious sourdough-like flavour to the bread.

5. Smoothies and popsicles

This is probably the easiest way to use up some extra whey! Turning your whey into smoothies or creamsicles.

6. Cheese Sauce

My kids love macaroni and cheese, and replacing the milk with whey results in a slightly tangier cheese sauce. It works for both packaged mac n’ cheese and homemade cheese sauce.

7. Treats!

Whey can be used instead of water for all sorts of things from jello to berry sauce. Or check out my recipe for a lemon and whey meringue pie.

8. Whey Cheeses

There are a number of cheeses that can be made from fresh sweet whey. However, unless you are making enormous amounts of whey, you will never have enough to make gjetost. Alternatively whey ricotta can be made from only a few cups of sweet whey.

9. Uses around the house

If you’ve used whey for all sorts of edible things, and you still have tons of it sitting around, you could use it to:

• Water your acid loving plants (in particular, rhododendrons and blue berries)
• Presoak beans and grains to soften them before cooking
• Feed it to your dogs / pigs / chickens
• Whey bubble bath: Add a gallon of whey when you fill your tub and it will bubble up! The probiotics in sweet whey is great for your skin.