In a bowl whisk together all the ingredients. Cover and set aside for 30 minutes before using. Cover and refrigerate if not using immediately.
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Notes
Prepared horseradish is made with grated horseradish root, vinegar, and salt. Prepared horseradish is not the same as horseradish sauce but is an ingredient in it. Creamy horseradish sauce combines prepared horseradish with cream, sour cream, or mayonnaise, which makes it milder and creamier (The Spruce Eats). If using prepared horseradish, I would start with a 1/4 cup and taste test to suit your tastes for heat level.