Wasabi is a spicy condiment often used in Japanese cuisine. It comes from the root of the wasabi plant and is known for its strong and pungent flavor. It's commonly served with sushi and sashimi, and it's known for its distinctive green color. However, what is often referred to as "wasabi" in many restaurants is actually a mixture of horseradish, mustard, and food coloring, as true wasabi can be quite expensive and difficult to cultivate.