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 granulated sugar
2 teaspoons lemon juice
1/2 teaspoon minced garlic
1/2 teaspoon salt
1/4 teaspoon ground black pepper

combine it all in a blender