Sweet & Sour Sauce

Below is a list of sweet and sour sauce I've tried that can be used for pork, chicken or fish.

Sweet and Sour Sauce (with pineapple chunks)

1/2 cup rice vinegar
1/4 cup plus 2 tablespoons brown sugar
1/4 cup ketchup
1/4 cup pineapple juice 
1 tablespoon cornstarch, dissolved in 1 tablespoon water
1/2 teaspoon soy sauce

Combine the rice vinegar, brown sugar, ketchup, pineapple juice, cornstarch slurry, and soy sauce in a small saucepan. Cook over medium heat, stirring occasionally, until the sauce begins to gently boil. It will darken in color and become thick. Immediately reduce heat to simmer and keep warm.

Sweet and Sour Sauce (without pineapple)
1/2 cup water
1 tbsp ketchup
1 tbsp rice vinegar
1 tbsp sugar
1 tbsp sake (I didn't have sake so I used rice wine)
1 tbsp light-colored (usukuchi) soy sauce or 2 tsp regular soy sauce + 1 tsp salt

In a small pan, combine sauce ingredients, except sesame oil. Add all the vegetables and bring to boil until carrot softens. Stir in the dissolved potato starch and remove from heat as soon as the mixture thickens and glazes.

Sweet and Sour Sauce (with honey)
1-1/2 tablespoons honey
2 tablespoons vinegar
1-1/4 cups vegetable stock or water (i used the pineapple juice from the tidbits + water)
1-1/2 tablespoons cornstarch

Combine honey, vinegar and 1 cup of the vegetable stock, and add to vegetables along with tofu. Bring to a boil and simmer for a few minutes to heat tofu thoroughly.