If you're looking for a way to add intensity, boldness, and a touch of interesting heat to your dishes, there are few ingredients that will work better than prepared horseradish. Horseradish is a root vegetable that tastes quite spicy - but that special kind of back-of-the-sinuses spicy - when it's exposed to oxygen. Depending on where you're shopping, you may be able to find actual horseradish in its root vegetable form at your local grocery store or farmer's market. But if you want to take