This is a recipe from my sister. She is studying natural (herbal) medicine. She uses this in the cold season. It does NOT need to be refrigerated, but does take 2 months to cure before you can use it. She mixed up a batch for me yesterday, but it won't be ready for 2 months. She recommends putting parchment paper over the mouth of the canning jar before putting the lid on, to prevent the metal from rusting due to the vinegar. If you can't find organic vinegar, get the kind with the "mother" in it. I use Bragg's.
Horseradish is antibacterial, and expectorant and a digestive aid. Garlic is antibact.and great for the immune system and colds and infections. Ginger eases nausea, colds and congestion. Cayenne is anti-inflammatory and anti-irritant, aids digestion and circulation. And onions have a zillion health benefits! LOL