Put a saucer and several spoons in the freezer
Wash the strawberries thoroughly and dry them with a clean towel
Remove the stems and chop the strawberries into small pieces
Add the chopped strawberries to a large saucepan or pot
Add the sugar and lemon juice to the saucepan
Stir gently to combine the ingredients
Set the pan over low heat and bring the mixture to a gentle simmer
Stir occasionally during the first 5 minutes to help dissolve the sugar
Once the sugar is dissolved continue to cook on low heat, stirring occasionally
after 20 minutes or so it's time for the Gel Test-- take a scoop of jam on a cold spoon and drop it on the saucer
Let it rest 30 seconds and then run your finger through it, if the line stays separated the jam is done, if it runs back together it needs more time, repeat the gel test as needed
Once the jam is done remove it from the heat, and place it in the clean jar
You can store the jam in the fridge for a week or two
For longer storage follow the directions for hot water bath canning, link is in the notes