Gently heat the applesauce.In a medium pot, add the runny applesauce. Put the sauce over low heat and gently heat it.
2 cups applesauce
Make a slurry.Meanwhile, start to make a slurry using cornstarch and water. In a small bowl, whisk together the cornstarch and water until you have a completely smooth paste.
Thicken the applesauce.Next, add the smooth slurry to the slightly heated applesauce. Continue whisking until the two mixtures are well combined.Then, allow the mixture to slowly come to a simmer. This will help the mixture thicken and cook out the cornstarch.
Notes
The amount of cornstarch you use depends on how thick you want your applesauce to be. The more cornstarch you use the thicker the liquid will become.You can strain the applesauce through a cheesecloth before thickening it with cornstarch. This will remove some excess water and make it easier to thicken quickly.