Step 1

Whisk together pineapple juice, ketchup, vinegar, soy sauce, and light brown sugar in a small saucepan.

Step 2

Heat sauce over medium heat until it comes to a simmer and all of the ingredients are combined.

Step 3

Stir together the cornstarch and water to make a slurry. Pour the slurry into the simmering sweet and sour sauce, whisking until the sauce thickens.

Step 4

Adjust color as desired by adding a drop of red food coloring.

Step 5

Remove from heat.