In conclusion, the secret etiquette rule of not mixing wasabi and soy sauce may seem small, but it can greatly enhance your sushi-eating experience. By following this rule, you’re showing respect to the sushi chef, allowing the natural flavors of the fish to shine through, and fully savoring the nuances of each piece of sushi. So the next time you enjoy sushi, remember to keep the wasabi and soy sauce separate. Your taste buds will thank you.