Open your can of cherries and drain the juice into a saucepan of medium heat. Place 1/4 of the cherries in a medium-sized bowl, then set aside.
Make a slurry by adding cornstarch and water into a small bowl. Pour in the slurry to the medium-sized bowl with cherries, and fold using a rubber spatula.
Pour slurry cherries into the saucepan and bring to boil until the cherries start to soften and release their juices for up to 15 minutes.
Add the sugar and stir well. Lower down the heat. Continue stirring the mixture until thickened for about 3 minutes.
Add the butter and lemon juice, stir and fold in until it incorporates. Then, add a small number of drops of red food coloring.
Afterward, remove from heat and cool, then transfer to a jar or place as a pie filling.