Blend strawberries and add to large pot.
Add lemon juice and sugar to pot and stir.
Cook over medium high heat until the temperature reaches 190 degrees, but do not bring to boil.
Skim and discard the foam.
Heat pint size mason jars and add the concentrate, leaving ¼ inch space.
Wipe rim with white vinegar and add flat and rings and tighten finger tip tight.
Carefully place jars in water bath canner making sure the jars are fully submerged.
Place lid on canner.
Once water hits a roaring boil, set timer for 15 minutes.
Remove lid and allow to cook for 5 minutes.
Remove jars and place them on a towel.
Allow jars to sit for 12 - 24 hours.
Remove ring and check seals.
Making lemonade: In a half gallon mason jar, add 1 jar of concentrate and 3 jars of water. Stir and enjoy.