4 cups white sugar
1/4 cup lemon juice
In a large bowl, crush strawberries in batches until you have 4 cups of mashed berry. In a heavy saucepan, combine the strawberries, sugar and lemon juice. Stir over low heat until sugar dissolves. Increase heat to high, and bring the mixture to boiling. Boil, stirring often, until the mixture reaches 220 degrees F (105 degrees C). Transfer to sterilized hot jars, leaving 1/4 to headspace 1/2 inch, and seal. Process in a water bath. If the jam is to be consumed immediately, do not bother with processing, and just refrigerate.