No Pectin Blackberry Jam Recipe

"This small batch blackberry jam recipe is easy to make, even if you've never made jam before. It doesn't use a box of pectin and instead uses the natural pectin in the berries. You'll also add sugar and lemon juice to help the pectin gel. You can also use powdered stevia to sweeten the jam, but this will result in a softer jam. This is a small bath recipe that makes 2 cups. You can make a few batches and can it or freeze it for later."