Summer fruits are wonderful. The farmer's market has tons of berries right now and they are just begging to be made into jam... so that's what I've been doing.
This is a really easy recipe, it tastes fantastic, and doesn't take that long to cook or process.
4 cups blueberries
4 1/2 tablespoons pectin
3 cups sugar (I used 1 cup lemon sugar and 2 cups regular sugar)
According to the recipe you should be able to get 6 half pint jars of jam. I was only able to get 5. If you prepare 6 jars you'll be good to go.
Prepare boiling water canner. Wash jars, lids and bands in hot soapy water. Heat jars and in simmering water until ready for use. Do not boil. Set lids and bands aside.
Combine berries in an 8-quart saucepan. Gradually stir in pectin. Bring mixture to a full rolling boil that cannot be stirred down, over high heat, stirring constantly.
Add all of the sugar, stirring to dissolve. Return mixture to a full rolling boil. Boil hard 1 minute, stirring constantly. Remove from heat. Skim foam, if necessary.
Ladle hot jam into hot jars, one at a time, leaving 1/4 inch headspace. Wipe rims. Center lids on jars. Apply bands and adjust to fingertip tight.
Place filled jars in canner ensuring jars are covered by 1 to 2 inches of water. Place lid on canner. Bring water to gentle, steady boil.
Process jars for 10 minutes, adjusting for altitude. Turn off heat, remove lid and let jars stand for 5 minutes. Remove jars and cool. Check lids for seal after 24 hours. Lids should not flex up and down when center is pressed.