Clean and thoroughly wash strawberries. Hull them and slice into quarters.
Add chopped strawberries to a bowl with the 4 cups of sugar. Stir to combine.
Allow strawberries to macerate for 1 hour.
Place strawberry and sugar mixture into a tall stock pot with a good pinch of salt and the lemon juice. Heat over medium heat until it reaches a boil. Caution, it will be bubbly and frothy.
Once it hits a boil, reduce the heat to maintain a gentle simmer. Stir occasionally until it thickens. This will take an hour or so.
Check the jam to make sure it has reached the jam stage by placing a small dollop on a plate. If it is thick and not runny it is ready to poured into jars.
Ladle hot jam into clean mason jars. I used a dozen 4 ounce mason jars but any size you prefer would do.
Place the lids and bands on each jar screwed down snug but not too tight. Flip the jars over and allow to cool to room temperature undisturbed for several hours.
Any jars that have not sealed after cooling can be placed in a boiling hot water bath for 5-10 minutes to try to reseal or you can store in fridge.