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Do tell. Put apple cider vinegar on them in a sealed container and wait? No refrigeration?

It's very simply. Put the radishes in a jar with a bit of salt. I also like to ad one small piece of ginger. Cover it with water and use some sort of weight to make sure they are not exposed to air - I use a stone the size of the mouth of the jar. Wrap it in a towel or put in a dark place. It will be ready in 3-7 days, depending on your personal tastes. When done correctly the water will have a slightly bubbly effect. The taste will be sour, not spoiled.

Many thanks, I'll have to try it! No refrigeration?

I refrigerate them after they are fermented to the flavor I want. They will last a couple of weeks or more (never made it more than that before I have eaten them.) :-)

Awesome Mackmck! Thank you for that recipe. I am going to try it!