Vegetarian Recipe: Tempura Dipping Sauce Posted by Susan Siow | Jul 23, 2012 | Sauce, Updates, Vegetarian Recipes The vegetarian recipe for Tempura Dipping Sauce: servings – 1/2 cup sauce Ingredients 1 tbsp soy sauce 2 tbsp rice vinegar 1 tbsp sugar 1 tbsp cool boiled water Method Combine all the ingredients. Stir until the sugar dissolves. Serve.