Step 1

Place vinegar, sugar, ketchup, and soy sauce in a small sauce pan over medium heat. Cook stirring occasionally, until sugar dissolves.

Step 2

Mix cornstarch and water in a small bowl, and add it to the saucepan.

Step 3

Continue stirring until mixture thickens. Remove from heat and add the pineapple juice.

Step 4

Serve with your favorite appetizers, like these Crispy Pork Wontons or Crab Rangoons.