Martha grows many different varieties of strawberry at the farm and loves making jam with them. This delicious recipe is adapted from her friend Christine Ferber's book "Mes Confitures." For canning directions, see How to Can and Make Jam.
In a glass bowl, stir together berries, sugar, and lemon juice. Refrigerate overnight. Transfer to a large, heavy pot and bring to a simmer, stirring until sugar has dissolved. Return to bowl, cover, and refrigerate overnight. Strain syrup into a large, heavy stockpot; reserve berries. Bring syrup to a boil, then cook until a thermometer registers 221 degrees. Add berries; boil 5 minutes more, skimming foam as needed. Pour into hot sterilized jelly jars. Let cool completely, cover, and refrigerate up to 2 weeks, or freeze up to 6 months.