First, prepare the blackberry, then mash them in a saucepan to release the juice
Add the bell pepper, jalapeno, black pepper into the mashed blackberry
Then pour the mixture into a medium saucepan and add sugar, apple cider vinegar, and lemon juice
Bring a boil and cook for 10 – 15 minutes
Add pectin to get the desired consistency
Stir continuously throughout the process
Now, identify end point doing finger test
Then, fill the jar with jelly and seal the lid of the jar
Apply sterilization process
Then, cool the jar and store at cool, dry, dark place