In a saucepan, combine corn syrup (or honey), rice vinegar, soy sauce, chili garlic sauce (or Sriracha), lemon juice, minced garlic, and ginger.
Heat the mixture over medium heat while stirring gently.
Once it begins to bubble, lower the heat and let it simmer for 4–5 minutes so the flavors can mix together.
In a small bowl, mix cornstarch with cold water until smooth. Slowly add this to the simmering sauce, stirring constantly.
Continue cooking for 1–2 more minutes until the sauce thickens slightly.
Remove from heat and let it cool. The sauce will thicken a bit more as it cools.
Store in a clean glass jar in the fridge. Shake or stir before using.