Combine water and cornstarch together to make a slurry and add to a medium saucepan.
Add sugar and strawberries and set over medium high heat. Bring to a boil and then simmer for about 10 minutes. During this time the strawberries will release their juices and then thicken slightly.
Stir in lemon juice.
Allow to cool.
Using a slotted spoon, scoop strawberries out of the saucepan and spoon on top of the cheesecake in an even layer. Whatever liquid is leftover once you've removed all the strawberries, can be used over ice cream or pancakes.
Chill the cheesecake in the fridge completely until it's set up, 6-8 hours or overnight.
To slice, use the edges of the parchment to lift the cheesecake out of the pan and transfer to a cutting board. Use a sharp knife, wiping it clean in between slices.
Cheesecake bars should be stored in the fridge. Recipe inspired by Completely Delicious.