Wasabi

A hot spicy green paste-like sauce used widely in japanese cuisine, especially with sushi. Has a taste reminiscent of horseradish or mustard, but much stronger. Real wasabi is made from grinding the stem of the Japanese horseradish plant (wasabia japonica) and mixing it with water. However the most common wasabi is fake wasabi, made from European horseradish, mustard and green food colouring.