Grab your fresh strawberries and wash each piece thoroughly. Then, make sure to hull the strawberries by removing the stalk and core. Afterward, chop the strawberries in equal sizes.
After that, in medium heat, fill your saucepan with half of the water. Allow to boil, then add the sugar. Constantly stir the sugar until it dissolves evenly.
Then, as you let the sugar dissolve, mash the strawberries using a fork or a potato masher.
In a mixing bowl, mix cornstarch and the remaining water, then stir. Afterward, pour the cornstarch mixture into the strawberries and stir well.
Then, pour the strawberry and cornstarch mixture into the saucepan. Cook on medium heat; you will notice that the mixture will begin to thicken and look glossy. Make sure that the cornstarch comes to a boil so that the consistency will turn transparent.
Try dipping a spoon and test if it is thick enough to coat the back. Doing this indicates if it is ready. After that, remove from heat, then allow to cool for a few minutes.
Grab a strainer and strain the fruit filling to a clean jar. Straining the mixture will remove all the fruit fibers to get a smooth consistency. But if you prefer to have chunks, you can opt not to strain them. Then, pour into a clean jar. Lastly, keep refrigerated until needed.