Thanks for MOXFACTOR'S reply.
Many years ago, I have stayed in Japan for a short period training the Japanese staff.Unfortunately, I did not appreciate the Japanese food . .(.the raw seafood ). Hence I did not bother find out the way they eat.
But , after a few years , I am very .... very keen about Japanese raw seafood. I go to a Japanese Rest nearly once a week.
Last few years, I have been Japan again ,and enjoy the food very much.
I prefer to get the answer here rather than to ask the guy from Japanese Rest. ..........If brother here can help me.
May be I should not say here........ Sometimes ,I feel that table manner is part of a good meal.(including of course ....{..Services, atmoshere,decoration, food, music ..etc ......} ..)
Of course, We can eat the way we like as I said in the first line.
Never know, I may have meals with a Japanes friend some day. I want to show him .........I am doing the right thing. !