I have started making my own fermented foods. Fermented foods contain probiotic's. I love onions but I am not able to digest raw red onions. However, fermenting changes things. So, I have started my first two jars of fermented red onions.
1 quart pure filtered or distilled water
2 tablespoons of Kosher Salt
2 big red onions
One Mason Jar with fermenting lid.
One glass weight to keep the onions below the water surface. If your onions touch air then they will mold and not ferment.