Add diced strawberries, sugar and lemon juice to saucepan and stir to combine. Begin to cook over medium heat until sugar has melted completely.
Smash strawberries with potato smasher until you achieve your desired consistency. Continue to simmer for another 10-15 minutes. Bring to aboil until mixture reaches 220 degrees F.
Pour strawberry jam into sterilized glass mason jar and let it cool to room temperature. Once your jam is cooled, you can enjoy or store in refrigerator. This recipe yields about 1 3/4 cups of strawberry jam.