I always thought horseradish was a mysterious and mystical substance that wandered around the grocery store in little jars begging someone to love it. Not so. It's actually just a root, and prepared horseradish requires nothing more than a grater, a few pantry ingredients, and (optionally) long arms since horseradish, like raw onions, will go after your nose if you dare to come at it with a grater.
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Step 1: Gather Your Ingredients
8 oz. horseradish root
1/2 c. white vinegar
2 tbsp. water
2 tbsp. sugar
1/2 tsp. salt
Step 2: Peel & Grate
Step 3: Measure & Combine Everything
This would look more exciting if the ingredients weren't all white. Store in the fridge overnight in a flavor-proof container like glass. It should keep for up to a month and can be used exactly like the stuff that comes in a jar.