In a small cup, whisk together 2 tbsp water and cornstarch. Set aside.

In a saucepan, mix together a cup of water, sugar, pepper, vinegar, and salt.

Bring to a boil over medium heat, reduce heat and simmer for 3 to 5 minutes.

Stir in the cornstarch mixture, then whisk into saucepan and cook until thickened, about 1 minute more.

Remove from heat, let cool, and use immediately or store in an airtight container in the refrigerator.