Place the strawberries in a large saucepan along with the sugar and lemon juice.
1 pound fresh strawberries, 3/4 cup granulated sugar, 1 tablespoon lemon juice
Mash the strawberries with a wooden spoon until mostly broken down and combined with the sugar.
1 pound fresh strawberries
Bring the mixture to a gentle boil over medium heat, stirring frequently to prevent sticking, until the sugar dissolves.
1 pound fresh strawberries, 3/4 cup granulated sugar, 1 tablespoon lemon juice
Reduce the heat to low and let the mixture simmer, stirring occasionally, until it thickens and reaches a jam-like consistency, about 15-20 minutes. You'll notice the mixture glossy and bubbling steadily.
1 pound fresh strawberries
Test the jam's readiness by placing a small spoonful on a cold plate; if it gels and wrinkles when nudged, it’s done.
Pour the hot jam into sterilized jars and seal. Allow to cool completely before storing.