Wash and chop the onion, horseradish, ginger, turmeric, garlic, and jalapeño peppers. You can leave the seeds in the jalapeños for extra heat, or remove them for milder fire cider.
Zest the lemon and orange, and then juice them.
In a clean, quart-sized glass jar, layer the chopped onion, grated horseradish, grated ginger, minced garlic, chopped jalapeño peppers, lemon zest, orange zest, dried rosemary, dried thyme, and cayenne pepper.
Pour raw, unfiltered apple cider vinegar over the ingredients in the jar until they are completely covered. Make sure to leave a little space at the top for expansion.
Seal the jar with a tight-fitting lid. If using a metal lid, place a piece of parchment paper or plastic wrap between the jar and the lid to prevent corrosion.
Place the jar in a dark, cool place (like a pantry) for about 3 to 4 weeks. Shake the jar daily to help mix the ingredients.
After 3 to 4 weeks, strain the mixture through a fine-mesh sieve or cheesecloth into a clean glass container.
If you find the fire cider too strong, you can add raw honey to taste. This will also sweeten it a bit and make it more palatable.
Store your fire cider in the refrigerator, where it can last for several months.
To use, take 1-2 tablespoons daily as a tonic or when you feel like you need an immune boost. You can also use it in cooking or as a salad dressing ingredient.