In a small to medium pot, add the 1 cup water, vinegar, sugar, ginger, garlic, ketchup and chili paste.
Whisk over medium to high heat until the sugar has fully dissolved.
In a small cup or bowl, whisk together the cornstarch and water into a slurry.
Pour this into the pot and continue to cook until the sauce begins to thicken and coats the spoon.
Remove from heat. The sauce will thicken more as it cools.
Notes
This sauce will be a light red/orange color on its own, but if you want to color it more, feel free to add a drop or two of red food coloring.Store sauce in an airtight container in the refrigerator for up to at least two weeks.If you’d like to use fresh ginger and garlic, you can; simply finely mince before adding to the pot.Taste the sauce when done and feel free to add more chili garlic sauce or some additional red pepper flakes for more heat.