Note: this makes a small batch of jam, but is easily doubled, tripled ... I like my jam on the lightly sweet side, so this is an instance where tasting as you cook is imperative.
1 ½cupsgranulated sugar,add more if your berries are very tart
2teaspoonslemon juice
Instructions
In a heavy bottomed sauce pan, combine blackberries, sugar and lemon juice. Using a wooden spoon, mash and crush the berries a bit. Cook mixture on high heat for 5 minutes, then reduce to medium heat and cook for about 15 minutes.
Remove from heat and pour into sterile jam jars or containers. Jam will thicken as it cools. If canning, proceed with your preserving, or let jam cool on the counter and then store in the refrigerator.