Mash fresh raspberries and measure out exactly 1 cup of the mashed fruit.
Place raspberries in a mixing bowl and add the sugar. Stir until well combined.
Stir in lemon juice and vanilla and let sit for 10 minutes.
While the raspberry mixture is resting, prepare pectin.
Combine pectin and water in a small pan and whisk together over medium-high heat. Bring to a boil, while stirring frequently.
Once boiling, set a timer for 1 minute and cook, stirring constantly. Do not cook pectin for more than 1 minute.
Add pectin to the raspberry mixture and stir until all the sugar has been dissolved.
Once the sugar has been dissolved, you are ready to place it into jars. Make sure jars are clean and dry before storing jam.
Fill jars until jam reaches ½ inch from the top.
Seal jars tightly with a lid and let them sit at room temperature for 24 hours before placing them in the freezer or refrigerator.