Kewpie Mayonnaise

I love kewpie mayonnaise, but can't find it in my hometown. I've tried my best to duplicate it, and this is what i've come up with.

Crack egg into the bowl of a food processor.

Add salt and sugar , and process until well combined.

With the motor running , add the oil in a slow , steady stream until all is incorporated.

With the machine running , add the rice vinegar.

Cover , and refrigerate for at least an hour , before ready to use.

egg yolks, canola oil, salt, sugar, seasoned rice vinegar, egg