Combine Ingredients: In a saucepan, mix the strawberries, sugar, and lemon juice.
Cook the Mixture: Place the saucepan over medium heat and cook, stirring occasionally, until the strawberries break down and the mixture thickens, about 10-15 minutes.
Blend and Strain: After cooling slightly, blend the mixture until smooth. For a finer texture, strain through a sieve to remove seeds.
Store: Pour the purée into a container and refrigerate or freeze as mentioned above.