"Cornstarch mix" refers to a combination of cornstarch, which is a powdery substance made from corn, and another ingredient or liquid. It is commonly used to thicken sauces and soups. Full definition
If glaze is not thick enough for your liking, add 1 teaspoon of cornstarch mixed with 1 teaspoon water at a time until desired thickness. (numstheword.com)
I also added cornstarch mixed with a bit of beef broth to the crockpot during the last hour or so to thicken it. (myrecipes.com)
Immediately remove from heat and stir in 1 tbsp cornstarch mixed with 1 tbsp water. (allysonkramer.com)