Sprinkle strawberries with sugar and toss with a rubber spatula until fully coated. Add a scant pinch of salt and mix to combine.
Once the berries have started to release their juices, squeeze in about a teaspoon of lemon juice. Bring to a gentle simmer.
As the sauce cooks down, the sauce will begin to thicken. This can take anywhere from 10-15 minutes, depending on the amount of moisture in the fruit.
The sauce is ready when you can run your finger along the back of the spatula, and you can see a clear line. The sauce will continue to thicken as it cools.
Notes
This fresh strawberry sauce is delicious as is, but you can also make a simple puree by adding it to a blender and processing it. Prefer your sauce seedless? Just use a strainer to catch the seeds.