Remove the leaves from the strawberries and slice them in half. Put them into a blender or food processor.
Process until the strawberry puree is very smooth.
Strain the strawberry mixture through a fine-mesh sieve into the saucepan while pressing as much juice into the bowl as possible.
In a saucepan over medium-high heat, add the strawberry mix and sugar. Mix well. Let it come to a boil then simmer for 10 minutes, occasionally stirring, until slightly thickened.
Pour it into a bottle and make a DIY cute label (optional but fun). Chill the syrup for about 45–60 minutes.
To serve, stir in about 1–2 tbsp of syrup into one cup of milk, or more to taste. For a larger glass, you may want to add a bit more syrup. That’s it—a simple and tasty strawberry milk that beats anything from the store!