How do Japanese condiment a seaweeds salad?
 

When I go to a Japanese restaurant and order a seaweeds salad, I always come up with the same question. What kind of sauce did they use with the seaweeds salad?

Since I am vegetarian, I would rather not use condiments or sauces with fish based ingredients.

So, any alternatives?

I believe it's just a basic Japanese vinaigrette. For the simplest of dressings, I'll use a 1:1:1 combination of white vinegar, soy sauce and sesame oil.

Here's a simple recipe which uses sugar as well :
How to make Seaweed Salad | eHow.com

it must be 100% or close to vegan food
 

Uusually, dressing for seaweed salad is shiso dressing.
Dressing is made from Shiso, Soy sauce, vinegar、and sugar.

Here is basic information of Shiso from wikipedia
Perilla frutescens - Wikipedia, the free encyclopedia

I think some contain katsuo bushi(dried fish).

Siso dressing has same colour as soy sauce, so it won't be difficult to identify.

However, I am not sure about outside of Japan.
Here in Vancouver, restaurants use different dressings.