I was just reading another thread about tipping in sushi restaurants, and am now wondering if I'm doing something wrong. People were talking specifically about tipping sushi chefs. When I sit at a sushi bar, I usually add 20% or so to the bill when it's presented. I have always assumed that this is shared between the servers (who bring drinks, cooked items, etc.) and the chefs. Although I often buy the sushi chefs a beer, I have never tipped them separately. I am a regular at this particular sushi restaurant and am always greeted warmly by my favorite sushi chef, so I've never even thought twice about whether I was doing something wrong. Should one tip the sushi chef separately, or is simply tacking a tip onto the bill, as one would normally do, just fine?