4 1/2 cups blueberries
Crush blueberries one layer at a time. Combine crushed blueberries and powdered pectin in a large saucepot. Bring to a boil, stirring frequently. Add sugar, stirring until dissolved. Stir in grated lime peel and lime juice. Return to a rolling boil. Boil hard 1 minutes, stirring constantly. Remove from heat. Skim foam if necessary. Ladle hot jam into hot jars, leaving 1/4 inch headspace. Adjust two-piece caps. Process 15 minutes in a boiling-water canner.