You can substitute with other berries such as raspberries, blueberries, and blackberries. You can also use cherries, pit and halve them and use them to make a cherry sauce.
You can either leave the strawberry sauce a little bit chunky and that works great for pies and cakes. Or you can blend it using an immersion blender or in a blender for a smooth strawberry sauce.
Store in a sealed jar in the fridge for up to 1 week, or freeze for up to 6 months.