Thoroughly wash, rinse & dry jars & lids.
Add berries and lemon juice to a medium pot.
Bring to a boil over medium-high heat. Crush fruit slightly with a potato masher to break it up. ( break up more if you like smoother jam)
Whisk together sugar and pectin and add to fruit, stirring until dissolved.
Return to rolling boil and boil 1 minute. Remove from heat.
Transfer to jars, using a canning funnel to keep edges clean, leaving a 1/2" space on top.
Seal and let sit at room temp for 2 - 3 hours (up to 24), until jam is set.
To store, freeze for up to 6 months or refrigerate and use within 3 weeks.