In a saucepan over medium heat, add strawberries and sugar. Stir and bring to a slight boil.
Reduce heat to a simmer and use a fork, masher, or back of your spatula to crush the strawberries as much as you can (based on consistency preference).
Then cook for 15-20 minutes at a simmer until reduced and thickened, stirring occasionally.
Cool and then pour into glass containers for storage.