Add blackberries (fresh or frozen), sugar, water and salt to a saucepan. Stir to combine, then turn the heat to high and bring to a boil.
Once boiling, use a potato masher to gently mash the blackberries to bring out extra flavor.
Turn the heat down to medium low, and let the mixture simmer for 10 minutes.
Carefully scoop out the blackberry pieces using a strainer and place in a separate bowl.
Let the Homemade Blackberry Syrup cool at room temperature for at least an hour before adding a lid and storing in the fridge for up to 3 weeks.
Add the leftover mashed blackberries to a container and place in the fridge to be used on top of pancakes/waffles/french toast/ice cream, or as an addition to mocktails and drinks.