Slice the sashimi and dip it directly in green mustard and Japanese soy sauce. When eating sashimi, don't stir the soy sauce and mustard paste in the small dish with chopsticks, because the Japanese think it is impolite to eat, which is a sign that they don't know how to taste sashimi correctly. Dipping mustard mud into sashimi can better arouse the original flavor of raw fish. According to Japanese custom, sashimi should be eaten from relatively light raw materials, usually in the order of arctic shellfish, octopus, mussel, scallop, sweet shrimp, sea urchin, squid, tuna, salmon and swordfish.