Spoiled milk? Actually, it’s kefir, a fermented milk beverage. A woman from my mother-in-law’s church gave her some kefir grains. These are a combination of yeast and bacteria, which work together to make kefir. These are placed in a jar which is then filled with milk. After about a day you end up with kefir, which tastes sort of like buttermilk.
Now we have some of the grains and are making kefir ourselves.