*Corn syrup keeps the sauce from crystallizing, but if you don't have corn syrup, you can replace it with 3/4 water and 1/4 lemon juice or white vinegar. So for 1 Tbsp corn syrup, you would use 2 1/4 tsp water and 3/4 tsp vinegar or lemon juice. (sounds weird, but you don't taste it at all if you only use that much.)