In a medium bowl combine sugar and rice vinegar and mix until sugar is completely dissolved. Add the mayonnaise, both sesame oils, and the mustard and stir until well blended.
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Recipe Tips
Refrigerate the salad dressing in a covered container for up to 1 week.
Rice vinegar is carried in most grocery stores, be careful not to purchase the seasoned rice wine vinegar, as it is sweetened and makes the dressing way too sweet.
The refined sesame oil can be found in the regular section of the oils in a grocery store. For the toasted sesame oil, look in the Asian section of your grocery store.