Start by getting a medium saucepan and combine sugar and water. Stir it gently over medium heat until the sugar completely dissolves. You’ll notice it turning into a simple syrup as it heats up. This part should take about 3-5 minutes.
Next, add the white vinegar, soy sauce, minced garlic, smoked paprika, and red pepper flakes to the simmering syrup. Keep stirring. Allow this mixture to bubble gently. The garlic will infuse its flavor, and the spices will heat up in the mixture.
While your mixture is bubbling, it’s time to prepare the cornstarch slurry. In a separate bowl, mix cornstarch with cold water until it’s smooth. This will act as your thickening agent. Once the sauce on the stove has a good boil, slowly add the cornstarch mixture while whisking it in. This helps prevent any lumps.
Allow the sauce to simmer for about 1-2 more minutes until it thickens to your desired consistency. If you prefer a bit more zing, adding grated ginger and rice vinegar at this time will enhance the flavor profile even further. Remove from heat.
Let your sauce cool down and then transfer it to a clean jar or container. Seal it tightly and refrigerate. It can stay fresh for about two weeks, but I doubt it will last that long!