Watermelon Jelly

Why I Love This Recipe
I got this recipe from the wife of the man who owns a local fruit stand. She says that she spreads this jelly on a hot biscuit, adds a tiny sprinkle of salt and it tastes like summer.
Ingredients You'll Need
4 cups diced watermelon, seeds picked out (slightly overripe is fine)
3 1/2 cups sugar
2 Tablespoons lemon juice
3 oz. liquid pectin
Directions
Put watermelon in blender and puree.
You should wind up with 2 cups of watermelon puree.
Put puree, sugar and lemon juice in 6 to 8 quart pot, kettle or Dutch oven.
Bring to a full rolling boil (a boil that cannot be stirred down) stirring constantly with a long handled wooden spoon.
Add pectin all at once, continuing to stir constantly.
Bring to another full rolling boil; boil 1 minute.
Remove from heat and skim off foam.
Pour into half pint jars, leaving 1/4 to 1/2 inch headspace, and seal.
Wipe rims, adjust lids and allow to cool completely in cool dark place free from drafts.