In a heavy-bottomed saucepan, mix the chopped strawberries, sugar, and lemon juice.
2
Stir over medium-low heat until the sugar is dissolved.
3
Increase the heat to medium-high and bring the mixture to a rolling boil.
4
Stir frequently while mashing the strawberries, continuing to boil until the jam is thickened and bubbles completely cover the surface, for about 10 minutes.
5
Strain the jam through a fine-mesh sieve for a smoother texture (optional).
6
Transfer the jam to a jar and let it cool to room temperature.
7
Seal jars and store in the refrigerator for up to 10 days, or freeze for longer storage.