I threw together a quick batch of fridge jam. Those new smaller clamshells of strawberries at Costco are about the right size for 2 cups of mashed berries....
2 cups mashed berries (about a pound)
1.5 c sugar (or so)
1/4 c lemon juice
In a heavy bottomed saucepan, mix together the
strawberries, sugar, and lemon juice. Stir over low heat until the sugar is
dissolved. Increase heat to high, and bring the mixture to a full rolling boil.
Boil, stirring often, until the mixture reaches 220 degrees F (105 degrees C).
Transfer to hot sterile jars, leaving 1/4 to 1/2 inch headspace, and seal.
Process in a water bath. If the jam is going to be eaten right away, don't
bother with processing, and just refrigerate.