Sweet & Sour Sauce
1/2 cup of pineapple juice - if it is a syrup then leave out sugar. Add some water if you do not have enough juice.
1/4 cup of vinegar - white, rice or apple cider vinegar.
1 tablespoon of sugar - for sweetened pineapple syrup, leave out sugar.
2 tablespoons of ketchup
2 tablespoons soy sauce
1 tablespoon of cornstarch or flour - stir and dissolve into pineapple juice and/or water.