edit: mykalberta - thats the one
for me, I reduce the soy sauce and onion
I found the actual recipe online a while back
1/2 cup veg oil
1/2 Cup roasted sesame seeds
1/3 cup soy sauce (Kikkoman)
2-3 tbl spoon onion (Diced)
1tsp garlic
1 tsp mustard powder
1) Mix mustard powder with about 1 tsp water until smooth
2) dice onion
3) chop garlic
4) roast sesame seeds for a minute or two until slightly toasted
5) Throw everything into blender and liquify
If it comes out too thick add a little water while blending.
This is all it is folks and i've been making it for around 5 years now. There is no egg, or mayo or any of that nonsense