Now that I'm making yogurt, I always have whey leftover. It can be used to replace liquid in baking, diluted for watering plants, as a starter for yogurt, as an addition to pet food,and can be added to the compost pile.
This picture shows frozen whey. You can freeze whey and use as needed.
Source: Read online - various sources
I'm watching carbs and sugar. I was told whey has a lot of carbs. I could be wrong, though.
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This is something I learned from my late great-aunt Azizi. Besides using whey in your cooking, you can use whey as a face toner or on your hands to balance your pH and rejuvenate your skin.
In many countries where cheeses are made at home, thrifty cooks use the whey as a soup base. My mother was from Poland. She made a sauerkraut soup that reminds me of this because of the slight tang. This recipe can be doubled.
These make really light and fluffy pancakes. I am going to freeze the rest for great breakfasts on busy mornings.
Many gardener's use whey to fertilize their plants. It contains nitrogen, phosphorus, potassium, magnesium, and other minerals that are beneficial in small amounts.