Add dressing ingredients from ginger though soy sauce to a blender and blend until smooth.
Turn off the blender and scrape down the sides.
Turn on the blender and slowly drizzle in the grapeseed oil. (Open the removable part in the top of the blender just enough to pour in the oil so the dressing doesn't splatter anywhere.) Blend until smooth.
Stir in pepper and sesame seeds.
Notes
Expert Tips: If you don't have a blender, you can make this dressing using a whisk. Just make sure to finely mince your ginger and red onion. How to Store: This creamy dressing will last for about five days in the refrigerator. I like to store mine in a mason jar with a lid—you can shake it up before serving if it settles into layers. I don’t recommend freezing this dressing, as it will separate when you defrost it. Notes for Special Diets: For a gluten-free version of this dressing, make sure to use a gluten-free soy sauce. Most tamari soy sauce is gluten-free, but check the label on tamari or whatever soy sauce you choose. For a vegan version of this dressing, replace the mayonnaise with a vegan mayonnaise, or replace the mayonnaise with additional tahini.