Place corn starch and 2 ounces of water into a small bowl and whisk until combined completely.
Place remaining ingredients (don't forget to add the remaining 6 ounces of water) into a medium sauce pan over medium heat. Whisk to combine.
Bring sauce to a slow boil and let boil for 1 minute.
Reduce heat to a simmer and slowly whisk in the corn starch mixture. Be careful because the mixture will tend to rise (and almost double in volume), so don't add the corn starch too quickly.
Continue whisking, cooking 5 minutes, until thickened.