how do you puree blackberries
To prep blackberries for making a puree: Heat the blackberries, fresh or thawed, in a saucepan over medium heat. Add 1 teaspoon of sugar and 1 teaspoon of lemon juice for every 1 cup of berries, fresh or thawed. Heat to warm the berries through, stirring as needed. Blackberry puree can be made with or without seeds. One cup of fresh blackberries produces 1/2 cup of puree, while 1 cup of thawed berries produce 3/4 cup of puree. Store the puree, seeded or seedless, in an airtight container or jar in the fridge for three to five days.