japanese ginger dressing
If you inhabit a part of the world that also contains Trader Joe's, they have a ginger soy dressing that may be what you're looking for. Lacking that, I'd think you could just make up an ordinary vinaigrette using rice vinegar, with some soy sauce and grated or finely-chopped fresh ginger.
re: Will Owen
Try to find a Japanese ginger grater--usually cheap aluminum versions are available at Korean/Japanese food stores. These have teensy sharp teeth that catch the tough fibres. A MicroPlane grater will do in a pinch. Will's basic recipe is fine for starters. Try adding a little shichimi(Japanese 7 spice powder)for some kick.
There is a brand of salad dressing called "Jo's". They make a carrot ginger dressing that is excellent and just like the kind that they have in japanese restaurants.
Even here in NYC, it's not available in every supermarket, so it might be hard to find. But once you find it, you'll be happy. It's addicting.
They have a website, but it doesn't seem to be working at this time. But at least you can see what the logo on the bottle looks like, so you know what you're looking for.
If you are looking for the orange-colored ginger dressing, like they serve at Benihana, then this is your recipe. I have made it several times and it is awesome! Really easy to make too -- just toss everything in a blender. It is from Top Secret Recipes.
Top Secret Recipes version of Benihana Ginger Salad Dressing
1/2 cup minced onion
1/2 cup peanut oil
1/3 cup rice vinegar
2 tablespoons water
2 tablespoons minced fresh ginger
2 tablespoons minced celery
2 tablespoons ketchup
4 teaspoons soy sauce
2 teaspoons sugar
2 teaspoons lemon juice
1/2 teaspoon minced garlic
1/2 teaspoon salt
1/4 teaspoon black pepper
1. Combine all ingredients in a blender. Blend on high speed for about 30 seconds or until all of the ginger is well-pureed. (http://www.topsecretrecipes.com
Makes 1 3/4 cups.